Dropshipping is pretty viable and doesn't require much effort/time, excluding the initial set up. Used to do it previously and could earn about $500-600 per month without much effort while I was studying in Poly. Check out my answer related to this here - https://seedly.sg/questions/how-to-be-a-successful-carouseller-on-carousell

There's soo many you can do: https://seedly.sg/questions/what-are-the-different-ways-of-producing-passive-income-available-in-singapore (the list is not exhaustive). But whether to find a job that pays more depends on your cost-benefit anaylsis. Is the extra work load worth the X amount? Is there more satisfaction with your new job?