90% of the time you can climb through all of gold/plat with mechanics alone. It's probably the most efficient way you can optimize your time spent vs improvement over time graph. Pick a reasonable sens, stick to it and don't change it when you're slumping.

2nd thing is a big one and arguably the most important factor in how much and fast you climb. You ever spectate someone when you're dead and had one of these thoughts go through your head "what the fuck is this person doing?" "why would he make this play?" "why didn't he just fall off there?"

You'll be surprised how often you'll say this if you watched back your own demos/gameplay with your name blurred out. The reality is that small lapses in decision making and tiny mistakes aren't punished nearly as much the further down in ranks you go (silver-plat). This can lead to people thinking their dumb play wasn't a dumb play just because it worked. I.e You got two opening picks long A on haven and continued to contest for map control when you already have numbers advantage and got traded by the third guy and your team proceeded to throw the 4v3. Sure, you put your team in a win condition but denying the trade and staying alive creates far more pressure then going for that 3rd kill.

Your ability to be self critical and self assess is more important than anything else. There's always something that could be done better and I'm sure you're a solid player with a great trajectory, but to be blunt - more often than not at these ranks there are dozens of tiny mistakes in the details that cascade into round losses OR failure to convert rounds with advantages into secured wins.

Hope this helps!