ac is not blowing cold

Take it to a pro. It won't be cheap .The system should be calibrated and set up to it's own specs. It may even cost more because of the crap you put into the system . The freon leaked out and so did the stuff you put in , More than likely

sadly, one must buy a new filter/dryer, then evacuate the system before attempting to run that compressor~

You have a leak in the system. most likely it is too large for stop to fix. If the stop leak you put in has dye in it then a black light should be able to locate it.