You’ll still be able to reference the company after you have left. I’ve always left my jobs before finding another. Providing there is a market available and adequate funds I would recommend anyone to do it.

After a short period of regaining your breathe and what purpose you had before you started then you will start to work on marketing yourself - GitHub profile/LinkedIn/meeting with a few recruiters...

You’re situation will probably remain the same until you jump. But you have to do the jumping, is my experience.