Kinda agree, previous mappack had way better maps (except maybe Beaches of Time

)
On current maps there are many wide turns which are driven at moderate-low speeds, so maps become boring very quickly. Many maps have freewhelling to keep the speed low. On several maps I got bored after finishing them only 2-3 times.
My suggestion: increase map difficulty at least a tiny little bit. You can also put sand, but try not to overuse it. You can also put wood turns, but make them wider or put walls on edges so nobody falls off map. Grass is fine too, as long as it doesn't have too much bumps and has signs pointing back on track.
Maybe even add GPS/Guide on maps if you decide to change difficulty? There is a warmup phase anyway, so I don't think that should be the problem.