I think I’m going to quit without having a backup plan

@horus don't you tell me what not to try.

I absolutely recommend staying in one job until you get the next one. Apart from anything else, it makes you significantly more likely to get the next one (and also more likely that it'll be a step up). Stick with what you have until you find something you want to move to.

I did that 3 times in a row and it seems that 4th is on its way. The thing is that every time I did that I had savings for at least the next 6 months and I planned to have at least 2 months off.

Last time it was actually 4 months between the jobs and it was ok.

I am currently in the same position as you, I started to feel that shitty feeling in the morning before the job. It just means its time to move on.