Pretty much anywhere being a competent seamstress pays well. The difference between highly skilled and competent is open to interpretation. The difference between being competent and the very basics that can assemble cut and sew patterns is huge though. Pretty much anyone can do cut and sew with like a week of training which is all the mass produced clothes.

But someone who is competent and can do quality alterations, mending, customize patterns etc, is going to make decent money. But I'm pretty sure where ever you live there are seamstress working and making good money.

I'm not even really sure where automation would have impacted being a seamstress. Sewing machines have been around since the 1700's and if anything the demand for textiles has increased more than the speed of production.

Maybe you are thinking more of knitting, which is highly automated and used to be a big job, now it's basically just a hobby.

Blacksmiths just evolved to modern day welders, iron workers, boilermakers etc. Still pays well.