You're insane if you don't launch in the US - even virtually. US is where the money is, US is where the market is, and US is where the only customers that matter are (unless you're selling to defence, gov or niche regional finance).

It makes acquisitions easier, it makes hiring easier, it makes marketing and sales easier and it makes billing easier.

Unless you want to bootstrap until you retire because it's a lifestyle business, then just do it where you are and chill - you are the 0.001%.