Welcome! Your drift wheels should last you a while, I bought a set with my first car when i got it, and have spent a while drifting with it on a few different surfaces, but the wheels haven't really worn that much so should last you ages. Rubber tires on the other hand, depending on the compound (soft/hard etc) can wear out very quickly especially if you do burnouts and what not with them
As for the hop ups, I think a lot of the stuff for the tt01's isnt legit tamiya, but will still fit the car and are more then likely the same quality.
A nice low turn motor should help your drifting, but make sure you esc can take it. A cheap upgrade could be a 15 turn brushed motor. An expensive way of doing the same thing would be a brushless setup but that will cost you a minimum of $150 for the motor and esc, and if you add lipo to that it'll cost another $100 on top.
Check out the drift section on this forum, they are probably the best people to ask about your car.