More credits than I know how to use?

I bought a x20 plan, coming from Claude, I thought I'd use it. I struggled. And now with these free 62500 credits we have to use by new years', I'm running several jobs in parallel through the day and not using it at a fast enough rate to not waste them. I've been really frivolously using tokens, too - like doing multiple passes over code for various optimisations etc. My latest idea is seeing if with non technical prompting I can make it conduct valid scientific research in some fields that interest me. But even then, I need more ideas! I have 15 apps/projects on the go already but most are settled. My deadline is January to use the credits. Suggestions?