I see lots of characters who I would love to tag, who I think would be really interesting to write with even if I don't know the canon, whose kinks and prefs match mine really well, etc.

But I don't think any of the, like, three characters I actually can play are going to excite the other person

I feel bad because they usually aren't getting tagged by other people either, but I also don't want to have the mindset of "well, if nobody else is tagging them, they'll just be glad for my tags"