>>16271656as said before learn judo i know a black belt manlet that was feared by discoteque brute who were 6.2+ and knew how to fight, i ve seen him take on multiple opponents too.
or you can go for jj or bjj or similar.
if you wanna also jewish maga(you wont win against a trained attacker though).
once you project a 6'3 nigger on the ground using judo or jj they are gonna have some broken bone and you can curb stomp their face break their ribs by kicking or disable their joint, they arent efficient on the ground.