My cry for help

I have been a MH player for a while now i started with world and have been trying to get into gen u as world was extremely fun and one of if not my favorite game my one issue being that it was too easy so i started playing gen u got past the kicker after one or two failed attempts and so i started trying to hunt tetsucabra and I CAN'T WIN i have tried over and over each time i learn more and have been getting better my last run being my best (i think) but i can't win so after around 15 hunts i came here wondering if anyone had any advise i don't just want to have others carry me through the game but i don't know what to do...

Edit: I just wanted to say thank you to everyone who helped me out i have figured out my main problem and have been taking into account as much as i can and i am now doing great and cruising through monsters without even dropping below half health so again thank you all soooooo much :)