I'd agree with Dusty00 that maintaining doesn't seem too hard as a Diamond. I've recently sunk down to Gold 2 purely through inactivity though, because I just haven't been able to scrape together time for Rifts, and Prize Fights, and also doing Daily Events for Gifts. Daily Events at least I can auto-battle through while doing work or chores and give me a ton of gold and moves to upgrade my fighters, and Prize Fights I largely enjoy. Rifts I just remain a bit iffy on. I just don't sit down and go "Yep, I definitely want to play this one mode of this one game for a good chunk of the next 2 hours." very often. The rewards are also just not as much there. Rift Coins are nice, but we have an alternative way to access those now. Diamond Keys are nice, but I don't even have direct access to those anymore, and they aren't... I don't know, I'm at that point where I'm not entirely certain why I'd want them anyway? It's not like I don't have diamonds I could work on, but I have an awesome roster, and the only reason to beef it up even further would be to do better in Rifts, which I don't really enjoy that much, nor do I have that much time for. Investing my time heavily in I mode I don't enjoy to do better in said mode I don't enjoy much would be... kinda weird?