You need to be aware, that destroying most vehicles doesn't make you best player in ground battles.
Instead of "cruising around like crazy" try to focus on helping team capture point. 1 destroyed enemy vehicle takes 100 tickets from enemy team. Captured point take them much more during next 20 seconds. And if you manage to hold that point with at least one more cap, you will be more useful to your team than best Rambo.
In WT you get points for almost any action you do. As soon as you understand that main goal is to cap points and win battle, your path to be best scoring in leaderboard will be opened