Reply To: how to get better
I would also reccomend joining an extracurricular choir, perhaps a church choir or community choir. If you like how he/she runs rehearsals, ask if they wouldn’t mind spending a few minutes giving you some pointers before or after a reherasal from time to time? My first year teaching middle school band, I went to the band director of my community band and did exactly that. He even mentored me over email. The above suggestions are great as well!
Happy to help,