@firstname.lastname@example.org for now, have you tried AWS free tier?
gives you a small server for 12 months. For the future, either make a mastodon support app that is paid for or collect donations through libera pay / paypal / bitcoin / etc. to fund the tools you need!
Small donations would be enough, there are tons of cheap VPS hosters. :)
Let me know when you've set up some form of donation, I'll chip in.
A Mastodon instance for info/cyber security-minded people.