Here's my 2 cents which is worth a lot less these days with inflation. I'm 45 and grew up hunting, fishing, spearfishing, trapping, and netting. I was in Special Ops for 20+ years and am still healthy, generally speaking.
I've seen it a lot and experienced it in different ways. The lack/loss of motivation to do the things we love. It seems there are a lot of factors for me: social, mental, and physical. I've had to look for other ways to get out and enjoy the outdoors after feeling like the effort wasn't worth it anymore.
Look for new people to engage with, travel a little to new areas, change style of hunting, shoot more for fun, compete (even a small bet with your buddy can be exciting), etc. Just need to change things up sometimes... take the risk, it's worth it. This approach changed my life at times and helped my perspective turn positive.
For me, the worst thing is to give up on living and become "OK" with a sad life. The outdoors is a huge part of our lives and it takes real effort/courage to change and find ways to enjoy it again. I'm really glad I did.