My 2013 MBP was the same, and eventually crapped out (power/charging circuit on main board. I couldn't upgrade to one with more RAM, due to some Apple like-for-like policy.

So I did vote with my wallet, and got a beefy ThinkPad running Linux. I wasn't that wedded to the Mac ecosystem, and this thing is a tank. If it needs upgrades or repairs, I can do them myself. So there are choices out there, if you're looking.