@Lemmchen I have been through a few of these including nextcloud, floccus sync, Wallabag.
The clear winner, and likely permanent solution for me ended up being Linkding.
Its blazing fast, simple, just a web interface, no sync tools to set up in each device/browser, add links using a simple bookmarklet in the browser bar (no extensions/sync). It has a very similar vibe to miniflux if you use that for RSS. I wish more self hosted apps were in this bloat-free minimalist style, its so good.