At the very least you need a host with shell access. Ideally on a VPS or Dedicated host so you have all the controls at your fingertips.
On this forum, if the admins don’t mind answering, what is the server setup like? It’s been mentioned digitalocean is serving the backend hosting needs, what distribution of Linux, memory ... does it take it from looking at DO side, to host such busy a forum?
I know other forums using nodebb might have large server setup but as far as DO, what would it roughly cost to host a forum used like the one here?