Should you worry about staying at one job for more than 4-5 years?

I’ve been at my current company for a little over 4 years now. I’m pretty satisfied with this job. I’m a good performer, I get good PTO, and I’m in a “relatively” safe industry . Maybe it’s the people I hang out with, or social media, but I feel this urge to look for a new job. I feel like I’ve stayed here too long, though I don’t really know why I’m looking. Given the market, I feel like I should just be content with where I am, but at the same time, I wonder if I’m closing doors as I gain more experience in this particular industry. My callback rate for jobs in my current industry is pretty high, but I’m worried that’s exactly the problem: my career might be headed toward being locked into one specific industry.