I'm hitting that 97% point in my Gmail and starting to figure out how to clear out the crap that's accumulated since I got my address in early 2004. I want to j

I'm hitting that 97% point in my Gmail and starting to figure out how to clear out the crap that's accumulated since I got my address in early 2004. I want to just delete massive amounts based on filters, but I don't want to accidentally erase receipts or actual messages. Not sure what to do that isn't a massive time suck, nor do I want to pay Google. Definitely pulled out some old memories when I go back that far into University days. It's hard going through 16 years thinking I never need to delete anything in case I want to look it up one day, but now I have to actually delete junk as it comes in.