I feel ya man. Without a premium account, grinding through vics can take a long time for anything over rank 2. Even with a premium account the grind can really suck. I've been playing since 2013 and I dont have a modern tank nor helicopters or even a jet. And honestly, I am ok with that. I enjoy the low tier battles. BR 1.3-3 is my sweet spot. Probably because I also tend to suck, so I am with like skilled players, where the higher the BR, generally, the better the player.
I'm back into the game, for the New Year event (my desired rewards are Polikarpov TIS MA and Merkava Mk.II) after a long break.
I play since 2013, too, but I have jets of three nations (USSR, USA and Japan), helicopters of four (USSR, USA, Japan and Germany) and somewhat modern tanks of USSR (with T-80B being the top) and Japan (the premium Type 74G Kai).
My favourite battles to play are Realistic Ground Battles of BR 3.7-4.7. They're dynamic and the average combat distance is quite close. The higher the BR, the longer the guns' range is, and the larger the maps are, so the combat distance is longer. Not only that it demands better skills of aiming and calculating the distance, but it also makes you drill the monitor with your eyes if you want to spot the enemy behind bushes (especially on maps like Kursk or Fulda with huge open spaces).
The rank VI-VII (modern tanks) battles are dynamic and fun in their own way, but can also be frustrating because of bugged damage model, when you pierce an Abrams or Leopard 2 twice barely doing any damage, and in response they one-shot kill your T-80 (but Western players still complain about "Russian bias"). However, this seems to become better in the latest version (compared to when I played earlier). The helicopters are somewhat balanced and not as terrible to play as they were year ago. My prayers were heard and the Mi-24D has 9.3 BR now (so it doesn't face SAMs too often, they were moved to 10.3).
However, the Realistic Air Battles are annoying, 6 years old and still no major changes. Except supersonic fighters with air-to-air missiles (such as Phantom and MiG-21), but they'll take a LOT of time to get to. To research them without penalty, you need to play on the rank V jets (F-84, MiG-15, etc), the gameplay of which is a complete pain in the ass, especially for a beginner.
That's why the RAB mode has merged Allies vs Axis teams so often (e.g. USA+USSR+France vs Germany+Japan on Normandy map), because the amount of players in air battles is decreasing. Earlier, the teams used to depend on the map (US vs Japan on Midway, USSR vs Reich in Stalingrad, etc), but now such matches are rarity. Sadly.
Anyway, I'm on my way to the Merkava Mk.2, an Israeli tank in the US tree, with 9.0 battle rating. Will be decent to play ground RB's along with FJ-4B and UH-1B (when I research it) in the setup.