[safety1st]

Without saying it explicitly, you've said that your current job is pretty good. Good money, getting promoted, the company offers side opportunities for growth, etc. The only problem seems to be that your actual job responsibilities are too easy or too narrow.

If you're at an early stage in your career that might be inevitable at any large company, they tend to have a deep bench of talent and assign greater responsibility to more senior people first. A small company can be different.

Fundamentally you are not trapped by the job, you can quit it any time but you lack sufficient motivation to do so. You didn't articulate any great reasons to leave this job. They may exist but I think you need to find and clarify them. For example do you have long term goals you're very passionate about which a different job would support better?