I've just restored my old wallet.dat from 9 years ago when I was mining and buying bitcoins - it now has all kinds of other balances as well (BCH, BCC, BCD, BSV - at least - as well as original BTC).  I worked this out by using pywallet.py to list all my addresses, and some websites to show my balances.

I no longer have or trust the original bitcoin software that I used to use, and I do not feel like installing anything new (my skin crawls just thinking of all the complexity I'd have to come to terms with to cash-out all those coins and several-dozen wallets).

Does anyone know of a trading exchange or an online web site (trusted!!) which will let me upload my file, supply my key password, and automatically do "whatever it needs to" to efficiently (sensible low fees) let me trade my coins, or, send them to my existing FTX deposit addresses - ultimately - I'd like to use FTX exchange to trade.

Stupid trivia 1: I was buying BTC off eBay for $12, and I refused to pay the extortionate prices of $14 that most sellers were asking at the time... (face-slap).
Stupid trivia 2: I was mining on my top-of-the-line GPU, but it overheated a few times, but rather than fix the cooling [a peltier that worryingly dripped condensate], I simply stopped mining (other-cheek-face-slap).