I need help

I plan to get the KF51, because it's one of the strongest MBT and heard it's a good tank-killer in the game also the Abraham X for its versatility, I'm planning to buy the battlepass soon. My problem is that my favorite MBT is the T-14 152 and I thought it was to be the strongest tank despite its slow reload, I upgraded it a lot and was my 1st Tier 4 tank should I sell it or not, I currently have 856 art coins and also I plan to sell the VT4A1 and leopard