Oh duh, you did say that. The only other thing I could think of is going to the way back machine and getting one of the earlier apps like Mlem or Memmy, or message one of the app’s developers for a version that is compatible.
The dev for Arctic has been pretty responsive and may be willing to help you out.
There are 4 on different instances when I searched, the most active one looks to be [email protected]
I personally havent tried it but “be the change” you know? I didnt see a few subs I missed so I made them (different account). Start posting on there and maybe it will inspire more.