You don't have to self host it if you scroll down there is a list of public instances: https://rss-bridge.github.io/rss-bridge/General/Public_Hosts.html
Reason to self host, some websites don't like rss bridge because it's a kind of adblock from their point of view, and they actively block the ip addresses of these instances. If you selfhost it, you can use these sites, because a single user instance won't generate as much traffic than 1000 users, so they won't notice your instance
Please don't delete and recreate if you can. Keeping the history of points is useful, if you delete a point you will delete its history. Wiki article with more details: https://wiki.openstreetmap.org/wiki/Keep_the_history