It depends on how intense is your program, whether it’s coursework or research and your supervisor.

When I did my masters n PhD, I juggle between being a tutor, part time at the university IT center, a lead at an agri tech startup, running my own design and contract manufacturing business, and studies. Mine was mix coursework and research, I was able to managed it as my supervisor was pretty chill, coursework part wasn’t that bad except a few crazy subjects, so I spent the rest of my free time working on other stuffs

While I'm not too familiar with your field (am in computer science), do look out for any opportunities that could best complement your current expertises and future goals, ask around potential supervisors, labmates/students in your field about it. networking would be essential.

Found and lobang my way into a lot of nice part time roles, like tutoring, IT support in the uni though professors and senior postgrad peeps
like IT support, usually it's pretty quiet unless it's the start of the new academic year..basically paid to just sit there and just do your own studies if there's no ppl.

this. ideally it would be best.