Ideas to earn some extra

Hello, 26 F I work in a Big4, but my pay isn’t that benchmark to sustain in Hi-Tech City. As per my firm we are expected to not work anywhere else or continue any form of extra jobs for ourselves because that would breach our trust with the company. Now as per the standard, I feel it would be helpful if I could make some extra 15-20k to not live end to end rather gift myself/ pamper myself after my hard work. I need your help to suggest me the ways or platforms which I can use my other skills/tech skills and earn some more without jeopardising my Ids/Govt details like an alias name or so.