Here's a couple things that have changed for me:
Collecting Collectible Manga
I went through the entire manga boom and beyond and largely avoided collecting manga. Animation was more interesting and I did not and still do not have the space to have a lot of different series on the shelf, much less the long and popular ones. Things have changed recently though, pretty much because I stumbled across Osamu Tezuka manga one day and then just kept going and going. It helps that most of what's on my shelf from him is from Vertical Publishing, which pretty much publishes the most well-made books on the market. It helps even more that I started off with Black Jack, which is super awesome with its very episodic storytelling that covers all kinds of ground and has the titular character pulling off some crazy stuff more than a few times. Buddha was a fictionalized biography turned into an illustrated epic, and I can't imagine there's a more entertaining way to learn about Buddhism. Message to Adolf is one third thriller and two thirds a chilling look at the sheer evil of Nazi Fascism and how propaganda and poisonous ideology can corrupt people.
That was the foundation. I've been slowly picking out nice editions of some other things too, like the VizBig edition of Rurouni Kenshin (for my money the best shonen series around outside of the neverending, sprawling adventure that is One Piece) and Kaoru Mori's A Bride's Story, which Yen Press puts out in a lovely bigger-than-average hardback that's ideal for showcasing her super detailed artistry. Most recently, of course, there's Gundam The Origin from Vertical, which is both very well done and released as a hardback in the absolute finest quality. With comics, I'm generally fine to go digital because of space and cost. But I love books, and I've gotten a lot of pleasure out of being able to get material I really like on the shelf in a good format. For my money it's a bit better than having a collectible release for an animated series, because what happens with that? You take it off the shelf and take out the disc and put it back. But a book, a book you feel in your hands and display while you use it, it's something you take with you.
Watching Less, Enjoying More
A lot of people "burn out" on anime after awhile. It's never really happened to me, and I think I know why. Over time, I learned to discriminate.
Here's what I mean by that. There are two major fatal flaws in archtypical "hardcore" anime fans. The first is overconsumption. The easiest way to "burn out" on anime by far is to binge on new material, whatever the reason for doing it may be. This wouldn't be satisfying for other forms of visual media, and it isn't for anime either. In any given anime season, in any given year, most anime that hits Japanese television just isn't that good. If you have ten TV series in a year that you really like, that's an excellent year. The rest are pitiful panderfests and / or substandard or else something that might be "good" but won't prove memorable in the best case scenario. You have your "old timers" looking back wistfully on the 80s and 90s over this, but it was true back then too. The difference now is, it's far easier (and cheaper) to follow the newest material, so they just marinate in mediocrity. You have people that try to watch something like 80% of what's running in Japan. It's crazy, it's a blind search for the next awesome thing that'll knock their socks off that just ultimately ends in frustration instead. It's a surefire way to find the best stuff, but is that worth spending hours just enduring content?
Part of what can fuel this is the second flaw, which is when anime fans adopt this excessively permissive attitude. Don't get me wrong, sure, the willingness and courage to try new things should be there, and lord knows appreciation of context can be lacking in talk about anime at times. Cynical anime fans are pretty much the worst. But what I'm talking about is the willingness to excuse almost any stupid or super convoluted plot, icky premise and tired perverted cliche in pursuit of some lame "look, it's not THAT bad" rationalization, which is the most uninspiring defense imaginable. I can't relate to this at all. I can understand sticking through to the end out of curiosity about where a story goes, or so you can analyze and / or compare what you've seen to something else. But there's a point where you just have to respect your own time, and that means not offering blind trust to some anime running at 2 AM that's based on a light novel and carrying a sentence-length title that no one would believe was the name of a cartoon if you tried to tell them it really existed on the street.
What I try to do is strike balance. In early days I pick out just a few series that interest me most I pay attention to buzz and try what I can as time allows, and if there's enough praise or interesting praise for something I overlooked then I look at that. The rest of my time goes to older anime, anime movies, animation that isn't anime, & comics / manga at times. It works out pretty well, although if anything I have the reverse problem of not quite getting to as much as I want as quickly as I want to. But on the whole I'm never dissatisfied with the time I spend on anime.
Incidentally, I think there is one surefire way to get back into anime or ward off burnout...movies and OVAs. Even the lesser ones can often be interesting in their way, and if nothing else they'll be more interesting to look at than TV anime. There's enough out there to last quite a long time, they are cheaper, they require less time investment, and as a general matter more effort goes into these than with TV animation that's a lot more prevalent and also been generally been more limited ever since the first Astro Boy animation came along in the 60s.