Short answer: do less and (if necessary learn to) enjoy doing less.
All commitments are choices and it’s important to learn which are essential and which aren’t. Will something you’re doing now really matter in ten years, or five? Will it help you? Is it essential to help another? Is it absolutely essential for you personally, or merely cool, or something you got roped into, or something you somehow feel obligated to do? Figure it out and concentrate on the biggest, most personally/professionally important items, and be strong enough to let the rest go. That’s not an easy suggestion, I know, and it’s pretty tempting to feel like you can ‘power through’ days/weeks/months of intense schedules, but for most things they’re just not that important in the long run, and other people can do it if you don’t, and you will burn out and have to look at that schedule at one point or another. Given your question here, maybe this is the time to do that?