I played War Thunder in 2014-2018 and begun playing it again a few days ago - exclusively as "Russen37WT" in Russian BR 3.7 tanks so far. My Russian aircraft are at 2.3 and were always meant to advance to 3.7 or 4.0 on this account.
Russians in BR 3.7 was and is a sweet spot for versatile fun: Good tanks, nice dogfighters, some light and fast tank-killing bombers (though the Russians use rather smallish bombs).
I'll certainly not go to high battle ratings because I dislike the grind, so there's no point in applying to return to the LED or WIN squadrons.
