Latvian Accepted, Main Line, Bilguer Variation game

This is a correspondence game I played against a much stronger opponent. Congratulations to Santiago as he played the main line almost perfectly.

I don't know much Latvian Gambit theory but was able to play the first few moves of the mainline just by following the opening explorer. Then went it went out of book things went south for me pretty quickly.

I still think the Latvian Gambit is a fun opening to play. It is quite effective against players who don't know it. Around 1100-1200 level many players have never faced it before and misplay it quite badly. Against strong players who know the lines it seems to be just better for White.

What would be useful for me is some advice on how I can improve my reasoning to find better moves at the point where the game goes out of the opening book.