I'm an 18 year old male, and I've never taken voice lessons. I sing a lot in church choirs/quartets, and I have since I was about 10. My current singing range (with clarity and volume) is Bb1-F4. On a good day, I can go g1-g4, but that's not consistently there. I'd like to get better, but I don't have a lot of money to throw at voice lessons. Any advice on how to better grow my range (specifically the lower end, as I am used primarily as a bass) would be appreciated.
P.S. I don't know if I should have counted falsetto in my range. I can falsetto comfortably up to about c5, but I'm kinda embarrassed to utilize that so I haven't gotten anyone's opinion on whether or not my falsetto sounds good. I do struggle with transitioning to falsetto (my transition point is f4).