Xfinity Service available

I moved to my current property in 2018. Current other internet options are less than adequate.  My current address says it is not recognized.  All my neighbors have xfinity and the cable line runs across my property to get to them.  What do I need to do to get your service?  I've talked to an agent who says its going to cost $4K.  That doesen't seem reasonable. I'd certainly like to discuss installation costs.