We don't always like what we're good at. You could be an exceptional project manager but your true passion might be in website design. Your employees could be the same - you just need to ask.
The reality is that we can't always do what we're passionate about. But if you could find some way to accommodate their passion as well as strengths, there is no better way to increase your team's engagement. Start with providing a safe space for your employees to tell you what they want to learn.