Where should I direct my energy job/career wise?

I’d like to make some extra money, but am unsure where to direct my free time side gig/career wise. I work full time (my job is with the state and rarely allows OT) and I am taking a semester off from my Masters program at the moment. I have applied to some part time jobs and didn’t have any luck. I’ve done various gigs such as Instacart, Ubereats, Lyft. Would it be better to put my time into learning a new skill? I enjoy science and have thought about doing consulting on the side in a nearby state (I can’t do it where I work due to conflict of interest). I also have experience leading free workshops that teach the basics of public speaking so I could direct my energy there and begin to charge for them?

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