Saw a post about this problem and wanted to write a solution post about it to try to help out other people.

Example solution 1 - Pictures:

I have made specific albums (digitally on my phone) for this exact purpose. I sort out and clean my pictures for example on my phone every 2 weeks. Use the "Habits" Android app for reminders and tracking (life changing tool for me). I class every picture that I would like keep in the category that best fits it (like "university", "family", "food" to give a few examples). It works wonderfully to find the picture you want in a snap of a second. Firstly you have way less pictures, so it's easier to browse and secondly you almost always know in which album it would be (already reducing by 10x the amount of pictures you need to browse). On top of that it's a nice way to recall what you have been doing in the past two weeks, stort free life retrospective time.

Example solution 2 - Websites:

Use the paid version of the cross platform "Raindrop.io" application (free one is just find from what I remember, used it for a year before switching to premium). You can create folders and subfolders with every website you bookmarked. It gets saved across all your devices and even backup the websites in their cloud if the eventuality it would happen to be taken down (you can still view the site).

(of course no ads or whatever, I'm not related to any of those projects/apps, I just really like them as they are helping me a lot day to day when facing what I call "knowledge management")

Two things that changed my life. Hope it will be useful to some of you too.