If you're trying to achieve points by wrecking things, but are losing points on subsequent wrecks, you need to change to a soft method of earning skill points. Drifting has been recommended.
Begin with buying some PERKS for your vehicle. Usually, collecting all of the bottom row will help reduce the losses but will cost you 28 PERK points. The bottom-right PERK can prevent a loss of skill points when you crash/wreck your car quickly a second time .
You may notice there are other PERKS that help you gain skill points quickly, buy those too.
BadRiver
Forza Veteran
Microsoft Xbox One X
Microsoft Xbox Series X