In my opinion, birch trees look really nice with the wood stripped, but anything other than that is kind of off-setting. So for me personally, I think building in a dark wood forest would be really nice, especially because there are mushroom trees(?) there which is super cute.
Umm I haven't really played the new update, but the most dangerous for me would be the vexes, because they're so hard to hit. Then again, they are pretty weak, but they're small and fast.
I'm pretty sure you just unfollow the group if you're following it, but if you're in the group leave your role by clicking the three dots beside the 'following'/'unfollow' button.
You should try commenting on lots of stuff, anything you think is good, funny, etc. You should also maybe set a profile picture &/or a banner saying something about creating skins for prices! I'm not really one to talk, since my account level isn't huge or anything, but this is what I've been doing recently and it's worked pretty well. There's also probably some other methods, but mainly try to get involved with discussion, hand out diamonds/emeralds on good projects, etc!