Hi! I'm @_jv_@mastodon.social and https://tumblr.com/jv, but this is my little instance where I'm doing a bit of an experiment to merge both. Basically, I'm trying to tumblr-like site that runs on the fediverse. I called it Goblin, and you can find the source code here:
https://github.com/johnHackworth/goblin

Goblin.band is my own instance, with me being the only account right now while I'm working on it. If you are interested to try it, let me know and I can ping you when I'm ready to let other folks in to test!