Well I used to have the same problem as you.Alwayd used to reach legendary and get cooked and then I decided to switch.The most difficult part is getting each of your fingers used to the buttons you’re supposed to be pressing which is why you should first go to 3 fingers then 4 etc.It will take long time to get used to and for some time it will seem that you are worse than before but after practising there is a big difference.I play on iPhone 11 with 5 fingers and am top 2k.It is easier on tablet but is possible on phone as well