Best way to find well paying side work as a programmer in 2024?

I work a day job as a .net / C# dev, and I'm looking for well paying part time / side work utilizing my current skillset. Do you work a part time software engineering gig on the side? what technology do you use? do you think the best way to find a gig is indeed.com, and filter 'remote, part time c#'? It looks like these gigs are better than upwork / fiver, etc. is there any other site that is good to find work like this?