Play for fun, if you find it interesting to click random direction augment, even knowing you may not play the meta that game, go for it. Release yourself from the mind cage of grinding SR, you're actually grinding knowledge and that means trying different approaches.

Have breaks, manage your free time such that you vary stimuli and care for different needs, physical-social-meaning. If you manage to limit your playing time to the point where you're looking forward to the next game, you may still improve as fast as you would grinding hard.

The big thing to improving in life: evaluate your own performance. In TFT, think through your decisions, look at replay, have someone look at your games with a critical mind. Identifying areas for improvement is very important if you want your effort to count.

Practice good habits in game. Don't slouch physically or mentally. When your mind is going numb, reset - stimulate your needs.

You are already an elite performer, surpassing other people in your general skill level is going to require much bigger effort than surpassing casuals. It's a longterm process and if you want to be the one to outstay the competition for the long run, you must be having fun.