The speeds that DSL connections deliver deteriorate over distance, so homes particularly far from their ISP’s local node will often see their speeds fall far below what was advertised. Some ISPs account for your location when giving you estimates of the speed you can expect.
If DSL is unworkably slow at your property, you have several options. You can sign up for a fiber plan if your household is connected to the fiber network. Fiber connections don’t lose speed over distance. However they are only available to a quarter of US homes, and rural areas are particularly badly served. Alternatively, you can use a faster cable connection: while cable also suffers from line attenuation, it can deliver speeds of up to 500Mbps, so you’ll have more speed remaining by the time the signal reaches your house. Finally, you can use satellite internet. More advanced satellite systems can deliver speeds comparable to DSL—no matter how far away you are from town.