i lost access to a Bitcoin wallet in 2017, i found it, what do i do?

sorry im exhausted and have been up talking to friends on call since this happened

so for context, back in early 2017 I bought and mined some Bitcoin for the tech novelty, ive always been into tech as a hobby and did some messing around with it, i lost access to it and 17 year old stupid me lost the piece of paper i wrote it down on

this has been a joke among me and my friends for years, that "if only i could get into that wallet I'd have X amount of money" (i didn't actually remember the exact amount i had left in the wallet) none of us are especially into Bitcoin nowadays, so it was mostly just something we joked about when we see it mentioned in the news

and we get to tonight, earlier tonight i bought like $4 worth of Bitcoin honestly just for fun because i saw a post about people talking about its current state, and in doing so i wanted a wallet, so i figured I'd give another crack at it like i do every few years for the hell of it, i first checked coinbase, i did have a coinbase account, but there wasn't anything in the account, but in looking through files from an old phone i stumbled across a picture of my computer screen with the key phrase pnemonic thing and was successfully able to sign in to a different non-coin base wallet (im not sure exactly what is safe to share and im a bit paranoid about it right now)

im broke currently, like struggle to make not very expensive rent with 2 roommates broke, needless to say, this is literally a life changing amount of money, and i keep feeling like something is going to go wrong, but idk how to emphasize its a SIGNIFICANT amount, and not just because im broke

what are my next steps? i have no idea how taxes work on this amount of money, can i just send it to coinbase and transfer it out? can you not do that past a certain amount? i have plans to talk to a lawyer and financial advisor, but again, currently im broke so im trying to do what i can first, im afraid to touch it at risk of legal trouble

any advice is greatly appreciated