The older I get, the easier I find it is to say no, and to let things go that I can't or won't find time for. I've done that with a few projects lately, the latest casualty being the Nanowrimo. I really enjoyed it last year, but am definitely not enjoying it this time round, so it's gone. The world will carry on (and possibly be a better place.....lol) without my literary offerings.
I'd rather spend my time on things I'm really enjoying and that mean something to me. I've also learned not to take on too much - better to do a few things well and on time, than struggle with a lot of things and spread myself more thinly. Admittedly it's not always easy to say no, but there are ways of letting down people gently and politely; I'm sure they'd much rather I said no at the outset than have to endure disappointment later on.
Once the final decision to let something or somebody go, it's amazing the weight that seems to be lifted from your shoulders. Maybe I should do it more often!