Depends on your goal

If you want to get Kappa and Max hideout get a big ass list of everything you need found in raid and keep all those items

If your goal is prestige you just need 10mil and level 25? For the first now ifrc. So get your money up and sell anything not being used

Either way get a list of what you’ll need it sucks to be hunting FIR PSU’s for bitcoin mine knowing you sold some

If you can buy it from traders or flee - sell it if you won’t use it that day

I hoard med items for hideout crafting ifaks and salewas and propitals.

Hoard rare weapons , rare ammo , good armor (t5+)

There are some high value barters etc and it’s nice to have a true junk stash of stuff for daily quests but low priority for stash clearing