Looking for fractional opportunities other than UpWork and Toptal, etc

Looking for recommendations on where this amazing community has found fractional working/ advising opportunities specifically in Operations and/or Chief of Staff space.

Specifically/ ideally looking for platforms that cater to startups but open to all. I'm aware of UpWork and Toptal but both spaces are quite noisey.

Appreciate any information/ leads!

I'd recommend considering Bolster. Check them out at
These communities are just starting, but hopefully they get some traction. You can keep an eye out here: luck :)