It's hard for the US to hire foreigners. Companies here have different labor and tax laws by state, and hiring non US nationals typically requires jumping through extra hoops, getting work visas, etc. And the EU typically has stronger labor protections than we do, which companies might be wary of. Then there's the time zones, language and cultural issues, different holidays, different expectations about PTO and work life balance (we have less of both), etc.
TBH if a company is going to jump through all those hoops, it's usually for people from much cheaper areas than Europe :/ Especially for remote jobs, where there are tons of Americans already fighting for in a race to the bottom.
If you could consider moving here and getting a work visa, that would up your chances significantly, I think.