Personally, when I come back to San MMO after a long time away, I like to start with a brand new character for exactly that reason: it gives me time to figure out which crap in my inventory is actually worth anything.

If you want a quick way to clean out your inventory that probably won’t get rid of anything too important, type “trophy” into the inventory search bar and ditch all that stuff. Use the 80 boost on a new character; it doesn’t lock you out of your personal story. If you want to keep going, use the wiki. In case you’re not aware, you can link an item in game by shift -clicking it. If you type /wiki in the chat and then link the item, it’ll bring up your browser with a wiki link to the relevant page. The wiki will often tell you if the item is worth having on to.