I'm using Spotlight to launch bookmark pages a lot and it's really efficient. Now since I migrated all my bookmarks to raindrop I can't do it anymore and it's literally a pain. Currently there are a whole bunch of apps that supports Spolight, e.g. 1Password, Papers, Dash, Evernote etc. So I hope raindrop can follow up soon!

Much like the existing Dropbox backup, but allow us the choice to backup to OneDrive, Amazon Cloud Drive, etc

Google Chrome Bookmarks shall synchronize automatically with Raindrop. If I change bookmarks in Raindrop, the bookmarks of Chrome shall change accordingly.

The ability to attach to the bookmark the link to the note in Evernote. Something like an extension for Trello

There needs to be an easy way to save Instagram posts on the mobile Raindrop app. Currently the only solution I've come up with is to copy the link within Instagram, paste it in a Google Keep note, access that link with Chrome on my Desktop, and use the Chrome Raindrop extension to add the bookmark to a collection. I get a lot of inspiration from Instagram, but this tedious process prevents it from being an important part of my Raindrop collections. In the past I could add the Instagram link to Raindrop via the app manually, but that feature has been removed.

or alternatively Readwise.io

To save articles from the feedly web app and also the feedly mobile apps.

Create a bi-directional connection from Raindrop to Notion aka let Raindrop bookmarks create items in Notion and vice-versa

sending articles to kindle would be a nice integration

Would be amazing to have the ability to use NextCloud for backup storage. Free, open source and can be self hosted too - so would be a good fit with your commitments :-)