hey man, I've been pioneering for 4 years now, and let me tell you, there's no better thing! I absolutely love it! Jehovah is the #1 focus everyday because you are always thinking about service--you are always in "the mode". If you want to do better spiritually, my number 1 suggestion is to pioneer -continuous auxiliary, or regular. I have learned to become a much better teacher, and speaker, not to mention much more familiar with the Bible, all because I started pioneering. I'm very happy with my decision, and I hope I never have to stop!
By the way, I appreciated very much your story. I know Jehovah will bless you if you make further efforts to continue growing spiritually. Why don't you try to reach out for more responsibilities in the hall. Also, try to go out in service with your elders, and the pioneers in your hall, and talk to the elders to see how you can make improvement. I hope this was helpful, and not an overload.