I know what you are working with.......
I've owned several vehicles that were worn out with high mileage and spotty maintenance.
There comes a point when the repairs need to begin, or the vehicle needs to be replaced.
My oldest was a 1963 Buick Skylark coupe, I became owner of this fine ride in 1976. It had well over 200 kmiles when I got it. Every fluid had an escape, multiple leaks. Fuel could only be filled to half tank, anything more would leak out. Oil was a temporary fluid, I had little $$ at the time and 2X weekly oil adds were killing my strained budget. So, I turned to used oil for $3/5 gallons. The 5 gallons would last almost 2 months. I was trying to save $$ for the repairs, but the costs were quickly outrunning my earning capacity. Fortuneatly, the Buick made the decision. It tossed a rod thru the side of the block. Funny thing, it continued to run for another 10 days. Ran like crap, but it ran. Dad heard me coming home a few minutes before I arrived. He opened the hood.....looked at me and shook his head. He said, "Call the junkyard. This ol' girl is motarly wounded. Put it out of our misery." My next car was a '71 Buick Electra 225 for my college car, purchased in 1983. This also had 150,000+ miles on the odo. It survived 4 years of college, then it was passed on.
I guess I'm saying you should make a choice to begin repairs or replace it. Stop hunting for problems or perceived issues. Prioritize the most critical repairs first, start on those. Work your way to the minor stuff. Or Replace it.