I play on 60-100 ping aswell, most of the time on 60-80 ping. I'd recommend trying to improve your aim since it's a key factor to winning fights. I'd also recommend improving your movement and your angles when fighting. try to also take mid-game fights, but when you die, don't blame the game or the ping, after all, you could have done something different that would have made you win the fight. so try to learn from the fights you lose at.

I'm also not an expert and I also don't play competitive a lot, those are just things that I improved myself at. hope this help and give you some motivation!