Unfortunately Circuit is dead and SRB2 is more of a precision platformer, so he’s not really equipped for the right job.
As long as Jet has air he’ll ride his Extreme Gear. In this state he’s incredibly fast and hovers over some obstacles, but he’s also incredibly slippery. Extreme Gear is especially good at gaining height from slopes. Always be on the look out for ramps to jump off of for insane amounts of airtime.