Best way I find to tame a bronto high or low lvl is to hit it one time and kite it to a cliff then pepper it with trank arrows

Brontos are a bullet sponging machine if found with correct base health and melee you will make raiding easier can get 150 Brontos to around 70k health and swiping it's tail can destroy x seeds hella quick

Simply find a sizable cliff and get it to chase you to it, then start pumping it full of Bill Cosby's special nectar

BEST WAY TO TAME!...... build some stone dino gateways... Place in a small area around the bronto... He wont be able to go anywhere. So you can then just sit back and shot away.