Here's the thing. You might be really good at biking. But that doesn't mean you're the best teacher for your own kid. It's not about the riding. It's about all the other stuff. The lectures, the little resentments, the baggage that's piled up over the years you've been developing your relationship. Your kid might not be able to hear you through all that noise. That's why you get a pro every now and then. It's not because the pro is better than you. Or because the pro knows what your kid needs. It's precisely because the pro doesn't: there's no background noise. Side perk is that absence makes the heart grow fonder, or something like that. Your kid will be stoked to show you what they've learned. Sometimes it's nice when it's not always you downloading onto your kid. Even if you do it better.
Or: prove me wrong and teach your kid yourself. Sometimes that works.
For the record: I coach my kids' sports. Team sports. I'm not a team-sports guy; never have been. They get a lot from me coaching their teams, I think because they have peers and can see in real time how other kids respond and learn, and that sets a standard of behaviour and engagement for them. But I don't push biking or swimming or skiing instruction much, if at all, because it's better that they have fun with me at those things. So they get lessons for those things, and they look forward to actually doing them with me. And I get to shut up for a change.