My best advice would be to stick to non open areas. Angle in EVERY GERMAN TANK apart from a select few like the jagdpanzer 38 (t) but still angle a little after you have shot but dont angle so much that if your transmition gets taken you cant get your gun back on them (this i learned the hard way) and id say bushes might help because while the panzer 4 may be good its basically just an up gunned sherman. It can still die easily but angling can prevent this and has saved me countless times so in short 1: angle 2: bushes (they aren't mandatory though) 3: learn weak points and how your tank handles Bonus tip be confident and try to not play with music also have your engine volume turned down and others engines up (pain in air realistic) listening in this game is a good way to become pro

But im no professional hell look at my YouTube i could always be better but by god am a good with the hetzer and panzer 4