I had accumulated about 300 over the years and went through the following process to tidy up.
1. Get all links into a html format
2. Run through a python script to weed out invalid / dead links.
3. Of the remaining active links , run them through a script ( used headless chrome puppeteer ) to gather title , tag info for each link .
4. Check if any of the links were part of a named folder and catalogue. Unfortunately some of the bookmarks were not filed into named folders.
5. Run a script to check for common keywords or terms and group. ( Used R script )
6. Manual check again and group them with appropriate #'s into Bear app which I use for note taking.
While it might seem Heath Robinson'ish way of achieving something , I went about it this way to hone the skills around python , Puppeteer and R.
Now when I bookmark something I catalog why and what I want from that link clearly noted down in Bear app with tags.