At what point do bookmarks essentially become an internet of your own making? I guess you need to create a search engine so you can search your bookmark collection, or maybe a Yahoo style directory to browse them.
Or...
Stop collecting the internet and give your brain a break from data overload. There is a certain flavour of FOMO that keeps tabs open forever and bookmark lists getting huge. Let go of it all. There will always be more data to consume every day, you'll never have time for that AND 5k of bookmarks. Use Google when you want to go back to something. I bet if you deleted 90% of those bookmarks you would not really miss them after a month.
Or...
Stop collecting the internet and give your brain a break from data overload. There is a certain flavour of FOMO that keeps tabs open forever and bookmark lists getting huge. Let go of it all. There will always be more data to consume every day, you'll never have time for that AND 5k of bookmarks. Use Google when you want to go back to something. I bet if you deleted 90% of those bookmarks you would not really miss them after a month.