Unity MMO Golang Backend Completion

I’m in the final stretch of a 2D browser-based online game. It uses C# frontend, Golang backend, Cockroach DB, Spine software for animations, Xsolla for payments. Currently most problematic is final touch for the core of the game - players action flow. It seems that current supplier didnt make it good so they dont know what to do effectively.

I won't accept any automatic bid on my project. I prefer companies. Long-term cooperation possible. You need to have portfolio of similar projects (no mobile games development only).