If your internet was working fine in the past, it is unlikely the problem is your internet plan. Slow internet could be faulting equipment, improper networking settings, or a problem on your computer. There are things on your computer, local network, and ISP that must all be working properly for your internet to perform at its best.
Try restarting your internet modem, networking equipment, and any devices connected to the internet.
Note: If restarting fixes your internet but it comes back within a few months, give us a call to track down the issue.