Great thread OP - I've skimmed what people are saying and it's made me reflect. I've done this 3 or 4 times over the years and it's really paid off. A long time ago I silently (didn't want to give an ultimatum) gave my then marriage a year to turn around - I stopped participating in the petty arguments and tantrums, stopped responding to the sulking, silent treatment, and bullying, and proactively tried to make positive shifts to try to save the marriage. DIdn't work, I left, it was a fabulous decision.
Sometime later, wiht new DH, we were both unhappy with work and lifestyle and decided that things would be different in one year's time. We weren't specific about how this was going to happen or what the end product would look like, we were focused though - we made some amazing changes to our lives that we've never taken for granted and have given us such a depth of happiness.
Odd timing, but right before the pandemic I realised I wanted some changes to my lifestyle, then the pandemic happened and I had the freedom to set the changes in place. This was a smaller one, but still a significant turning point.
More recently, for my own physical and psychological wellbeing, I set a limit to my career, and then before the year was out I was retired. Very scary, and has been quite a process, but the benefits are unending.
Making these comitments to make life better is time well spent even if the changes seem like hurdles. My focus now is on resting my mind, exercising, my friendships and family, the hobbies I already had, and developing new interests. So far I only have one new interest, but I'm enjoying it and it's enough of a new thing for me for now. I'm enjoying feeling fitter - like you OP, I started to experience some decline as I wasn't taking care of myself properly, it's so importnat to hang on to a basic level of fitness for as long as we can, and prioritising this makes me feel better about myself, I know that I've got my own best interest at heart.
It was nice to have the chance to reflect back on tis, sorry for taking up space here, I'll have more of a read now.