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What else should I self-host?
You may or may not be a developer, but I would like to vote for Gitea/Forgejo. Should you ever get a grasp of git, a git forge is great for keeping code and even plain text documents recorded. It’s my favorite self-hosted service by far.
It can even operate as an OIDC server, so you can create a single login for all your services (that support OIDC).
I’ll also recommend Grist, an alternative to Google Sheets (and Notion, I believe?). It’s a web interface to spreadsheets that supports Python code as formulas. (I’ve also tried Nocodb, another Notion alternative, and I much prefer Grist.)