Best of luck. What do you find lacking so far?
retro
Hoarder. It is bookmark management with AI tagging. Tags are amazing when you don't have to assign them yourself.
AllDebrid or Premiumize are both popular alternatives. AD is considerably cheaper, even with Premiumize's Black Friday sale in right now. However, Premiumize allows multiple connections, so if you can split the cost with someone, it becomes the cheaper option.
I've heard DuckDNS has become more unreliable. You could try another service like afraid.org and see if it makes a difference.
I only need to send sign up and password reset emails for Jellyfin, I don't need to receive any emails back.
You can selfhost Standard Notes. The notes are encrypted client side before they reach the server.
I've been using OwnTracks for a while and it works really well.
You can use Subtify with Navidrome to import your playlists. It matches your Spotify playlists with your local music.
Would you only be duplicated content from wikis already available and simply cherry picking from those lists instead? I don't see how FMHY is difficult to navigate. Yes it has 10,000 links, but you go to the topic you need and it has 10-20 links of which you can pick and choose.
Hoarder has just released support for SingleFile also. You can set Hoarder as a save location in the SingleFile extension.