I've been using Karakeep (formerly Hoarder) for a few months. So far, I like it. I particularly like having an iOS app so sharing new bookmarks from different apps is really easy. Instead of pulling from the browser, it retrieves its own copy with a headless Chrome, so if you need a login, the snapshot breaks. But, overall, I've been pretty happy.
After quite some exploring around and struggles I made my peace with https://raindrop.io. Am I happy with that? Of course not. But that's the only hosted one which has extensions and apps for almost every browser and OS I use. I wish there a functional open source service (hosted) with wide range of platforms support that I could pay for and use.
My links about bookmarks and links below.
https://github.com/rumca-js/Django-link-archive - django app, RSS client, simple web crawler, under construction
https://github.com/rumca-js/RSS-Link-Database - my bookmarks repository
https://github.com/rumca-js/RSS-Link-Database-2025 - RSS links for year 2025
https://github.com/rumca-js/RSS-Link-Database-2024 - RSS links for year 2024
https://github.com/rumca-js/RSS-Link-Database-2023 - RSS links for year 2023
https://github.com/rumca-js/Internet-Places-Database - I also maintain a list of domains found in the Internet
https://rumca-js.github.io/search - search that uses links maintained in zip files
https://rumca-js.github.io/music - my music library, browsable
https://rumca-js.github.io/bookmarks - my bookmarks, browsable