Help me decide. I have a very old plan. 15+yrs

I have an old contract from maybe around 2010. I have unlimited data, with no restrictions. I really don't want to get rid of my unlimited data, it's not that I use a ton of data, but every time I go into the store, they try to get me to sign a new contract. So I'm really just keeping it only because they seem to want it.

However, this spite based decision of mine prevents me from deals on phones due to the fact I'd have to sign a new contract. So my question is, am I holding on to this for no good reason?

Edit: I currently pay $100/month. I only have the one line. My current usage is 20-25 Gigs /month. They recently took away my hot spot so now I either have to get a hot spot subscription, or use a third party app.