What I do is that I block the ddlg, teacher crush, bdsm, nsft, etc. tags and all its variations. I would also block all the nymphet-nymphets. Like if there's an nsfw text post or photo, you block the user. It's not perfect, but it gets the job done for me. It also seems like you're going through the tag or following it, so posts you might not like show up on your timeline. I recommend not doing that and only looking at your dashboard full of only people you followed and vetted.
But also, some coquette overlap is a bit inevitable. Sadly, the coquette/nymphet tag became so ubiquitous that this is a problem in pretty much every feminine aesthetic. People aren't tagging it because the image represents a crush on an older man or such. It's a catch-all that people use to get exposure, and the term has been watered down an incredibly large amount.
Also, I don't know your situation, but seeing slightly nsfw things (like images of lingerie or listening to a Lana del Rey song) isn't illegal or immoral as a minor. Do whatever feels comfortable for you, but you're not actually in danger unless you actively engage with an older man
Stay safe!
