Either retire for the 100% free flex return or speed. Might want to start looking into when you want to invest in another attribute (agility or carrying) and multi-training too.
When you restart your build for next season do this: 83 spd 77 agi 77 car
That should keep you bzy for a few seasons. Make sure you get quad training done. Also make sure you make the dot on day 40, boost on day 48. ( Those are the atts at where you let the alg take over. )