The best advice anyone will ever give you is this:

“It doesn’t hurt to send resumes.”

You got a good thing right now, and that’s good. But there is no way you or anyone else can know if you have the best. So send out resumes. It doesn’t take very long to update a resume, and send them out.

If a place looks good, and you get an interview, by all means take it. Then ask all the questions you need. The easiest time to find a job is when you already have a job you don’t mind staying at.

And maybe you find out that it is as hard to find a job in your industry as you expect, which will give you a greater sense of feeling about your current job.