Struggling with remote work

I’m a new grad, and my first job post grad is completely remote. I have long meetings (prob around 2-3 hours of meetings on a meeting heavy day). I feel so exhausted and miserable every day after work, even though I’m not doing anything intense mentally or physically. I wake up early and take a walk in the mornings, have a slow morning routine, as well as stepping outside 2/3 times per day. Honestly idk what to do to make it better. It’s weird because in my undergrad I would do long hours of much more challenging work from home and it wouldn’t bother me in the same way. I think the long meetings are especially challenging for me, unsure though. Any tips would be helpful!