Trust me man, you need to be highly determined and DO NOT RAGE! Try to understand what killed you or damaged you and see how you can avoid the situation in the future. This can take hours, if not days, but it will work. This isn't something that happens between days or weeks, it took me my entire career throughout 2 years to reach this point (take long breaks from the game if you feel REALLY stuck) This is me about 800 hours talking so please try to do that. It is slow but highly rewarding I am not saying that you need hundreds of hours to be good, just try to learn and optimize your strats for a better time :D
Or just use the stun build like Baseball bat Throwable object Stun grenade And bear trap With this build You make the boss on black bridge turn into a punching bag