Thanks @wim_v12e for the useful tips given about #pleroma :)
Check out their blog post at https://github.com/wimvanderbauwhede/limited-systems/wiki/Mastodon-and-Pleroma-on-the-Raspberry-Pi-3#installing-pleroma
Also those running around in circles installing Erlang: https://www.erlang-solutions.com/blog/installing-elixir-on-a-raspberry-pi-the-easy-way.html
@superruserr I'm glad it worked for you!