Write a resignation application and give it to the boss. Take a picture. Or just leave it on the boss's desk and send him a message telling him that you left your resignation application on his desk.

In this way, you can have evidence to show that you have clearly proposed to leave your job.

Then try to communicate with your boss and ask him to sign for you and agree to your resignation.

If the boss still doesn't agree, you can leave directly after 30 days of formal application for resignation (the probation period is less than 3 days). In this way, you are legally resigned, and the boss must pay you according to the legal requirements and handle the normal resignation.