Great pic. It says a lot! The issue is in the sealed system. Either there is a refgerant leak, a restriction in the flow of refrigerant or the compressor isn’t pumping properly. The frost pattern on the evaporator coils is very helpful in diagnosing a sealed system issue. Unfortunately, it’s not a repair that an average DIYer can do. The EPA requires that only certified technicians can enter the sealed system. You would need to have a quialified refrigeration technician to do the repairs. .