It won't help now you already have chaos but the best way to keep some order is to have yearly or monthly folders and inside make a new folder each time you download it wants to be like 2020-12-12 then they will easily order by date, you could add a clue word at the end.
Import software like Lightroom will do this for you but it's ot a great chore to do manually.
Don't forget to regularly back up to an external drive.
Having been quite keen on digital photography for most of 20 years I'm pleased I got things reasonably organised quite early on (and safe on two external drives) and it's a pleasure to look back through older stuff these long evenings.