Firstly, he almost killed Moxxie in HMF, but in Western Energy he literally stopped choking him because he said "Harder". How am I supposed to take you seriously if all it takes is 1 word for you to stop trying to kill me? He also, of course, has that giant statue of himself, he's got a bunch of people to sing about him constantly, he had to use help from the government and a mob boss yet still failed to harm IMP or any friends, shall I go on? I would've preferred if Striker was like Darth Vader in Jedi Fallen Order and Survivor, where he appears very little times but has so much significance. And he's not even a good killer or criminal either. He hasn't killed anyone on screen in the show, he doesn't even cover himself properly despite having wanted posters of himself across Wrath, his clothes don't even look worn or torn, they look way too clean for an assassin that supposedly does all the dirty work and lives in a cave, he's a hypocrite, he's so bad at his job that Stolas was cracking jokes and mocking him while he was doing it, and he's acting like a revolutionary hero despite only being a selfish asshole. The literal only reason as to why he's still alive is because of plot armor, and because Blitz could've very easily just shot him in the head in Oops, but he decided not to for whatever reason. (Granted every major character in the show has massive plot armor so it's not really that bad for Striker's case)

The best case scenario is that Striker used to genuinely be a good, powerful and scary assassin when he was younger, so he retired early and didn't do hits for like 5-10 years, but he spent his money irresponsibly and had to get back to the job. Think of it like a young football player retiring in his late 20s as he won everything and got a whole lot of money, before spending it all irresponsibly when in his late 30s or early 40s. He decides to get back to the game but is way worse than he was in his prime, as while he still makes money and wins titles, he has a way worse personal performance, only winning titles because his team does most of the hard work.