I have Mastodon, mail, XMPP, Coturn, and Nextcloud instances all running on a single Raspberry PI setup quite easily thanks to yunohost.org. They have ISO's for

I have Mastodon, mail, XMPP, Coturn, and Nextcloud instances all running on a single Raspberry PI setup quite easily thanks to yunohost.org. They have ISO's for just about any hardware or a VPS. Hostman and Mastohost are among the other managed hosters of fediverse instances.