can I ask for a reasonable raise
You should have done it much earlier. Now it can be a bit too late - I have just read an article warning of recession in Poland and the job market which is ceasing to be friendly to workers coz companies are planning to lay off people.
Our rightard PiS has led to this situation - in good times, they squandered billions on benefits instead of investing wisely or saving them for bad times like now. Bad times have come and everybody will pay for PiS` incompetence.
I hope PiS voters will go first.