This may sound silly, but I actually do a little more racing when I'm suffering from burnout. But I change it up. I'm an oval racer and I keep a 1/12th scale on hand just for times like these. Because its not something I expect to do well in, I just go out and drive and have fun hanging out with the guys, but I know I'm not very good on track so it completely transforms me.
When I'm racing oval I feel I'm good enough I can run with just about anybody (maybe not beat them, but run with them). So thats my target, and thats where my competitive fire gets its workout. When that fire disappears I start turning right and the only competition I have there is the darned pipe. Survive for eight minutes and its a victory
It might work the other way around for you.