Got some questions as a streamer and how do you look at ranked games

Been streaming this game for over 4 months and I got some questions

1. Is QP the best way to practice the game? If not, then what is the best way to practice

2. How do you treat comp matches? I mean.....after how many losses do you get off comp no matter what rank you are?

3. When there a series of losses over the week......how do you take it?

4. when you have over 200+ hours in the game and hardstuck.........does it mean I am the worst player?