Tips for Voice Masculinization/Deepening?

while my question is aimed more at transmascs, trans men, & masc-presenting nb people, i will happily accept advice from anyone who has it !

ive been trying to make my voice deeper & sound more masculine for a good while now, and i feel like my progress has been stagnating as of recently; i do vocal exercises once a day (primarily the ones from the following videos: Video 1 Video 2 ) as well as neck stretches (which ive heard can help, but even if it doesnt do all that much it feels nice (*￣3￣)╭ )

would anyone here have more tips on deepening my voice until i can get access to testosterone?