Whatever the reason you've ended up feeling undervalued at work, it's absolutely worth addressing. If you can change the situation, you'll be happier at work, and if you can't, you'll have a pretty clear sign that it's time to move on.
Make sure you're communicating and that your boss knows what you're working on and where the challenges are. Set up regular check-ins if you don't already have them and spend a little time highlighting problems you've solved, or ideas and innovations you've come up with.
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