Own search engine for specific websites?

I want a search engine that indexes and displays only the sites I ask it to (my bookmarks). I often come across insanely good articles and resources, but because I don’t really need them at that moment, I forget about them and can’t find them when I need them. Maybe there is a search engine at which you can throw good websites you find, and then use if you think you came across it before.

I am not sure if SearX will be able to help here, but I am sure someone will have advice...

Currently I am just storing everything into a Notion database, but then I either have to write down what that website is, or I will never find it.

Thanks and have a great day.