Don't lose hope. You are doing well. You have good reputation. Minsan I feel the same way when a post didn't earn that much, but I'll move on, then write another one.
With regards to your English grammar, you did good. Ako nga kahit di magaling, sulat pa din ng sulat. Don't mind those critics. They are just policing who to criticize. What's their gain? Gratification for being critical? It doesn't matter, they just get their own life.