Only a few go on to other top jobs in show biz, like Gary Linekar going from football into match of the day presenter for years and the bbc's top earner.
The obvious thing would be to save up while in the top spot but we know these guys live like Kings and blow all the cash on partying and women etc
Being at the top in sport doesn't last long for most, even in fake sport like wrestling unless they have the charisma to keep their character resonating with the fans
It would be very difficult to get a normie job after being famous, humiliating in fact. Like in The Wrestler.