personally i use yearly folders + a sub-folder for the occasion :)

software: any common filemanager of your choice will do - be it GUI or text (for example midnight-commander :)

eg 2024/some-place-or-important-event/

btw. i know multiple people who organize their photos in this way and some of them have far larger collections than "just" 5 GB... ;))

just my 0.02€

ps. as with every "important" data, follow the well-known 3 - 2 - 1 rule for backups (at least: 3 generations, 2 different medias, one copy "offsite")

for example i know someone losing their entire childrens photo-collection due to dropping an external hdd...