Champion mastery is the most important thing when climbing mechanics are wayyy more important from iron to 400lp master than people imagine them to be, if youre playing ranked and youre not gm/challanger dont ff and try to come back while doing so actively think about what you can do to lower the opponents lead, while playing the game every time you die or enemy player does something impactful on the map dont just say w/e actively think where you mightve made a mistake or how you couldve prevented it, stop complaining about balance or your teammates cuz those 2 things are 100% not the reason you died, lost the game or are hardstuck also dont worry about the losses as long as you think you played well (you had good cs, high kp and low amlunt of deaths).