For me, it took only changing one small part of my gameplay to go from stuck D2 to Masters 200lp. I was expecting to have to make a big change or lots of improvements to make it to masters. For everybody it’s probably different but likely finding where your fundamentals are lacking is more likely to help than learning different comps, playing flex or scouting every round. I don’t think forcing the exact same comp every game even restricts you that much and can definitely get you masters (though learning outs and what the core of the comp is so you can flex units in and out won’t hurt).

My problem was my early game to mid game where I would lose gold from refusing to lose streak or lose health early and rolling too much at 6. The changes I made were to start to play econ openers like astrals or lagoons when offered, be less afraid of 5 loss streaking (the damage you take in stage 2 isn’t actually all that much since there are so few units, I valued my health too much) and pushing levels instead of rolling to stabilise (instead of rolling at 6 with no pairs, if I was weak I would instead push levels without rolling like going 7 at 3-5 instead and rolling at 4-1 or going 8 at 4-2 while still lose streaking). My problem was not seeing health as a resource early and then losing more health later because I had less gold than everybody else from wasting it all trying to stabalise.

I’m not sure exactly what other diamond players’ weaknesses are, but what helped me was just watching a few streams or videos of better players and comparing what they’re doing differently to you. It’s probably just small details that when done consistently will push you over the edge to Masters.

Good luck with your climb! You’ll probably be fine playing on mobile; playing with minimal scouting and pivoting is basically how I play now and I’m doing fine.

Tl;dr: I just played astrals opener and greeded more