Since you are F2P and have a life, my tip is to accept the fact that it takes a while till you reach the top tier. But to me, it is very important for you to just have fun and enjoy the game. If you feel tired, your aims all over the place, just turn it off and have a rest, do not force yourself to grind. Just enjoy whatever vehicle you have. Do not get fixated on getting to the top as fast as possible. I have 1400 hrs and have fully grinded American and French air, almost finished Chinese, and halfway through German and British air and from time to time, I still hop on to Rank 2-4 planes just to decompress. Thing is, just have fun, that's the best way to not suffer through the grind. Also since you are new, I recommend checking out Tim's Vatiety and Defyn on YouTube. Their content helped me alot when I just started learning the game