dude, it's simple
buy a thermostat for PLN 30 and replace it, if it doesn't help, throw away the equipment in the trash or you have gas leaked and you have enlarged the ozone hole or your circuit is clogged and it is not efficient and of course in these hot weather you can increase the thermostat setting and what you keep inside is also important such frozen ones can keep the temperature longer

which makes the arrangement of eastern friends more economical

I would also check the arrangement of the thermostat capillary, it may have moved or fell off the evaporator handle, which does not collect the temperature
greetings