Book recommendations are good. I really liked the SuggestMeABook subreddit. It'd be nice to have that here.
I think what those other places are missing are some kind of book club. If there's enough critical mass here, it'd be interesting if there could be small groups read a book together and discuss here.
I tend to be one of those people who wants to say yes to everything. That's partially because I'm a people pleaser and don't want to disappoint. But I'm trying to be better about protecting my time. If something doesn't get a "hell yeah" gut reaction from me, it's probably best that I decline. "Present me" tends to overestimate how excited "future me" will be about some commitment.
Having said that though, it should be a healthy balance I think. Some of the better experiences I've had have been ones where I was initially reluctant about them but ended up being glad I did them.
So... Balance. Protect your time. But it's also okay to occasionally step out of the comfort zone.