Clutch Problem? Options

[1994whitecelicag...]

Hi everyone, I am new to this forum and would consider myself a amateur when it comes to working on cars. I would really appreciate it if anyone could help me with my car. So a while back my car stopped shifting. I would press the clutch, but it would not free up the gearbox. But after doing research online, I replaced both the clutch master cylinder and the clutch slave cylinder since people say they wear out eventually. After installing the parts and bleeding the system, the car was able to shift again! But it stopped working the next morning when I tried to drive it. So I've left the car sitting around for a week and checked it again and it shifted! But its just really spontaneous since there are times it would work and maybe in a couple hours it would stop working. Or it wouldn't work and maybe if I try again the next day it would work. Would it be my clutch? Or do I still have air in the system? Any help would be appreciated! I have a 1994 toyota celica gt with about 170,000 and I do not know if the clutch has been replaced since I bought the car used.