I will say one of the reasons why some radfems on tumblr feel isolated is because they don't know how to use tumblr.
There's a post going around with about 1k radfems who are looking for women in their area. There are many issues with it I've found when following up on it.
Some women will add their location and that's it! They'll yell into the void and hope the void yells back.
A very large portion of these women have their messages set so no one can contact them or so no one can contact them unless they are already following that user. Hint: if you're following them, you probably don't need to reach out right?
Other than a few women running regional blogs (blessed angels) no one is checking the notes! Someone will say "well there's probably no radfems in [wherever city]" and there will be like 10 women in the notes saying the same thing! (Not that it would make much of a difference given the last bullet but yeah)
Don't even get me started on the women who reblog it and put the location in the tags instead of just adding a comment/reply (only you, and maybe me, will see the tag. Not everyone has the version of tumblr that shows tags. Meaning few women will know you added a location)
Tumblr, like other social media, and like space lol, is a bunch of orbits. You have to reblog posts to get them into other orbits. Say a woman adds her location to that post, it will only be seen by a fraction of her followers. Me and some of those regional blogs and some other dope women do reblog it sometimes, boosting it into our orbits. But it would help if others did to.
And this applies to all kinds of radfem posts on tumblr. Likes are cool I guess but reblogging is where things start moving. Libfems and anti feminists seem to have figured it out. I see so many great radfem posts and discussion die out because they have little interaction. More exposure will increase the interaction and that leads to women connecting.
I hope this will inspire you to change your settings, reblog radfem posts, and interact with each other.