some ppl will tell you need to get out from your comfort zone and aim higher

if you are the ambitious type and can tolerate newfound stress at other companies, then take a challenge and find a new job with higher pay.

but if you are aiming for work-life balance and planning to start a family, then from what I read above, this sounds like a perfect job.

Alternatively, stay in this job and further your studies part-time. It sounds like a very comfortable job to stay on while you can study part-time. If you pursue post-grad studies, you need a lot of research/reading time (don't listen to some who only aim just to merely pass their course and got a terrible CGPA). Then only later, you find another job.