Dear Anistasija,
I am from the US but do have a house in Riga, and travel back and fourth quite frequently.My partner , who is Russian, and stays in Riga for about 6 months of the year doesn't speak Latvian very well , but does speak Russian and English, and finds that if she speaks English to the Latvian people, shops, etc etc....she gets much farther along, !!! Anyway, perhaps you need to learn Latvian, Good luck....I hope all goes well.