Focus on Russia. They’re your main problem. Tip with that- get Russia to not see you as a threat and see Japan as a major enemy. Get them to move some troops to fight Japan. that will give you a better chance of quickly taking Russia. (Send everything to Leningrad, then smash through to Moskva)
Use your fighters and fleet to keep the Channel clear for a later invasion of Britain. Once you have Moskva, it shouldn’t be too hard to take Britain.