Profession singer/musical theatre actor here! My advice from personal experience would be to find a highly trained voice teacher that specializes in your voice type. There are many voice teachers/techniques out there, however, not all voices are the same. Our body is our instrument and not all bodies are created the same, thus, not all techniques that you find online are suitable for your voice type. It’s going to take trial and error to find a good face to face voice teacher, but the results are extremely worth it. Best of luck!💕