Everyone else is giving advice to stick it out until you get a new job, and that's probably good advice, but if you really can't stand it then leave soon. Things will probably work out. It's not all doom and gloom out there.

Like another responder, I left my job in Feb 2020 without something lined up. There were bumps, one company I was in the hiring pipeline with laid off their whole recruiting dept. It took a few months more than I was expecting but I had a better paying job by summer.

My current company had steep layoffs late last year but has some openings already. I suspect many companies will be the same, with positions opening up again.

Do not quit your job without at least a written offer. It is 100% an issue for resume reviewers, hiring managers and interviewers. I have seen plenty of candidates passed over for exactly this reason.

My brother quit his (admittedly bad) job in February of 2020. He didn’t find work beyond Amazon warehouse temp till 2021. He blew through a ton of savings and is still recovering. While don’t believe and sincerely hope we are looking at anything like 2020 again, it is impossible to know and it’s way better to pay it safe.

Your job search will be easier while still employed and less stressful.

Don’t worry about getting assigned more assignments. You can leave those behind when you take a new job. Seriously, after a few years you’ll have seen plenty of people come and go, sometimes suddenly. Organizations will find a way to fill the gap (or try aren’t a very good organization).

No. Your assignments are irrelevant; that handover is what your notice period is for.

Line up a new job first. Might not be as easy as you think.

If you want a break in between tell your new job you can't start for a couple of months.