If we're still working in our current job, we're still luckier than those out there who are still struggling to find a job.
Don't waste it by thinking short-term about leaving your job before you can find a replacement. There will come a time when we can find something better than this.
So, hang on a little longer and enjoy what we have and be grateful for it.
There's this popular saying that sometimes what you are complaining about, someone else is also praying to have it. Hence, it is good to protect the job you've got while you get more skills or acquire more certificates for a better one. Quitting your job when you don't have a plan or nothing to fall back on may be a huge mistake.
I know some persons who quitted their job before securing one and they went through hell to get back on their feet.