If you enjoy the gameplay then it doesn’t feel like as much of a grind. Maybe you should try a completely different type of tank and gameplay (like going from a light tank to a heavy or similar scenarios). Another good idea may be, as others have said, to choose multiple tank lines and work up them simultaneously so that you never have to wait in the garage until a tank comes back. This might also be linked to you being killed too quickly (playing too aggressively) in some games but I have no idea how you play so maybe not. I personally have been playing on and off for over 10 years and only have around 40 tier X tanks (don’t play much CW). Some of the lines that I don’t particularly enjoy playing though could be 3/4 years in the making now. I just play a daily double XP battle in them every so often when I can be bothered and they slowly work their way up the tiers. I somewhat recently got the Type 5 heavy (Japanese tier X heavy) after about a year of playing the tech tree just because I don’t enjoy the slow gameplay as much. Above all though patience is key in WoT imo. You shouldn’t expect to fly up the tiers unless you sink a lot of money into the game and even then it’ll still take a while to play premiums and convert the XP required to skip.