The umbrella services is expensive AF. Thailand doesnt give citizenship as easy as the west. I have a friend who has been using their services for years in the hopes of getting a citizenship. They take a HUGE % of your pay check for their services and paying taxes. It is definately not worth it.
Why dont you create a company in the US and have your clients pay the company instead of you. If the company is the one generating income than you should not be liable for taxes here. Wouldnt that be the best solution?