What should I do if my sponsor competes with the series or event sponsor?

First, winning helps - if you're consistently on the podium, that creates its own story and exposure. Work with series organizers to understand what's allowed and what crosses into commercial territory. Generally, you can promote your sponsor on your own social media and team channels, but problems arise when it becomes commercial on the competing brand's official channels. Focus on your personal brand building and content creation that features your sponsors. Some series have specific rules about banner heights, product distribution, etc. - know these rules and work within them creatively. Building a strong personal following gives you leverage regardless of series sponsorship conflicts.