Not significantly more.
Good, and you understand how the level calculations work, right? If you earn $121k, you're only going to calculate taxes for $1k of income for example.
It sucks to pay even a cent to the US, but probably still cheaper and less risk compared to giving up citizenship -- especially if you have family there that'd you'd like to be able to visit in the future.
for a consultancy in the US
That makes it a bit more complicated, but if you're abroad over 330 days, you'd fill form 673 to prevent withholding for example. Have you not retained an accountant to help guide you through this? Based on the information you've shared, it seems like you're paying a lot more into the system than you need to.
You know that Amazon bought Twitch many years ago, right? And they still own it.