Google translate gives us…
Good morning, I enter my account to play Diablo 3 Season 26 and I see that my account is empty, as if I had never played, I am missing 15 players, some of them with more than 1500 hours of play, is it a server problem? a problem with my account? What I can do? I wait for an answer, thank you very much
That brings us to…
I see 12 heroes on the US region…
…and none on the EU region.
So, did you accidentally log into the EU servers instead of the US servers?