It’s a bummer to “have” to step up to a newer vehicle if you’re not wanting to spend a bunch of money, but your analysis of your old truck, sounds like it was the right choice.
Congrats on the new rig.
We have essentially the same truck with a 6 speed stick.
IMO, the one necessary thing to do, if not done, is get secondary fuel filtration on it.
It’s pretty common the stock type filters contribute to early injector failure. Lost a couple of mine at about 120k even with quality stock filters.
Add a secondary spin on filter base that takes 2 micron filters, between the OE filter and injection pump.
There are kits for about $200 or if you’re a bit resourceful you can get the parts for under $100 and a little ingenuity.