You might be better getting into contracting for a while instead of fulltime. It has it's downsides and a feast/famine sort of cashflow, but it's a quick way to earn while building new trusted contacts and networks to help reveal more fulltime opportunities in future.

I personally would stay away from the online platforms (although others may attest differently), as they can be a race to the bottom in terms of price.

Instead hit up tech meetups in your area, give some talks, and let people know you're a gun for hire. Write some linkedIn posts in your area of expertise (yes folks that overdo this can be a bit cringe, but a little high effort content will go a long way).