I guess spanish, easy to learn (just need like 3/6 months of time) and huge numbers of girls "unlocked", portuguese it's a close second since i think Brazil is an hidden gem. For Asia only chinese and Japanese are languages worth studying imho, but it's a total different beast compared to spanish or portuguese, you are looking at years of grinding to get good at it. Ofc you can get away with a basic conversational level if your SMV makes up for it but we are still talking about a minimum of 6 months to a year of diligent study, especially if in the meantime you have a full time job or other shit to take care of