Nelnet to Citizens or Other

Hi guys. First time poster, short time lurker.

I have about $52K+ in student loans. I had loans already since 2014 and then I went for my MBA in 2024 which increased my student loans to where it is today.

I have been paying about $590 per month and only about $180 is going to principal where the remaining is going towards interest. It's tough to see.

Anyways, Citizens sent me a letter saying I could borrow up to $53K at 6.5% interest over 15 years. I hate the 6.5% but I can't help to think that my monthly payment will be a lot lower and I can actually breathe at least a little bit.

I say "Other" on my post title because there might be better rates out there. That's why I'm here and asking for your advice with these two questions:

1. Should I make the move to another loan service?

2. If yes, what loan service would you recommend? If not, why should I stay with Nelnet?

Thanks!