YVW! Glad you got it figured out.

However, your current Mac Mini
might not be a lost cause. Several models can accept memory upgrades.
Check out this page at Other World Computing to see if your Mac is capable:
https://eshop.macsales.com/shop/mac-miniI've got a Mac Pro that's going on fifteen years old and still going strong. All I've ever done to it is upgrade memory, replace the hard drives and reinstall the OS from scratch every year or so. I've got 24 GB of RAM and four x 4 TB drives. It might not be the fastest Mac, anymore, but it still runs as well as the day it was new.
Replacing drives and adding RAM is far cheaper than buying a new computer. Besides, you earn a lot of geek cred when you can keep an old computer running in top condition for that long.

Do check out that site. OWC is one of the top sites to buy upgrades and accessories for your Mac. They'll give you store credit for returning used RAM sticks which you can use toward the purchase of new. They also guarantee that their RAM will work in your computer, provided you follow their instructions.
I've been using OWC for years and I only ever had one problem with RAM not working. They exchanged the goods for new, no questions asked. When I told them that I was working on an important project for a paying client, they even cross-shipped me the new RAM. (They sent me the replacement, immediately, on the promise that I'd send them back the non-working one as soon as I received the package.)
I don't know which flavor of Mac Mini you have but, assuming yours has upgradable RAM, you might be able to keep your machine going long enough for you to save up and get the computer you really want.