I cannot relate to your post enough!
I've been in the same job (Customer service rep) for 10 years now! To be fair my role is fairly cruisy but its the same thing day in/day out, there's no opportunities for advancement and its leading me nowhere. Like you, I need to feel like im accomplishing something.
I had hoped to hit 10 years, take long service leave and go on holidays then start looking for other jobs... then covid hit haha.
I've decided that I am going to do a Uni prep course and possibly apply for uni next year! completely different to where I was looking but its kinda exciting!
Caro1107 you do you! ignore the naysayers! you don't need that negativity. Only you can change your situation, so if you find something that interests you, do it!
All the best