AC cooling problems on my 1981

Be aware that newer cars are now using R1234a, just noticed that on wife's 2018 Expedition.

I think that by me just driving the car more will solve my ac problems. I don't drive it enough and I know that's the main problem. When I bought the car it had been sitting in storage for years, the sticker on the plates was at least 6 years old, if not more. I'm not saying it hadn't been started, but obviously had not been on the road. The shop I use checked it out and we had some leaks. We put in a new aluminum radiator, water pump replaced all hoses and belts. Replaced oil pan gasket, oil pump, replaced the power steering's power assist control valve and other things. I'm not having problems with leaks any longer other than the ac. I know not driving it is the worst thing you can do; I also know you guys know life is busy. I just need to make more time driving it, and I will.