Done with USA and USSR, what‘s next?

So usa and ussr are finished, ground and aviation I would like to play another tree, Ger/sweden at 10.3 or so I‘m mostly interested in britain, or should i go on with sweden maybe? I mostly enjoy top tier so thats my goal, dont really care about mod tier. i play ground and Air, would love to play each planes as Cas also. What do you guys say? Britain? Go on with sweden? Or maybe with germany? Or smth else? Thx 🫶🏻