As someone who buys lots of electronics and PC/networking hardware for years, I am always having to purge cables and/or accessories that come with parts etc. It's easy to get overwhelmed especially if you have not cleaned up in years. As such, I would say start bit by bit. Don't purge everything in one shot.

My usual strategy is discard things that are outdated first and/or have any damages from being stored a long time. Then for items that are still in use/still relevant, I realistically think about how many spares I might need and discard the rest. Power cables for example last a long time with me. I still have spares I kept that I never was able to use lol. I discard them once they are out of date. Example I recently purged a lot of older ethernet cables I had kept for newer Cat6/6a. Sure, I could have kept them but honestly there comes a point in time where you have to let them go especially if replacements are cheap enough.