There are several changes your ISP (Internet Service Provider) can make on their end to improve your service. It’s often helpful to give them a call. However, ISPs have some of the worst customer service out of all companies, not just ISPs. They’re so bad, they are listed among major airlines and cell phone providers.
I’ve found using online chat from the ISP’s web site to be a less frustrating way to get help. My ISP sent out a technician to my house (for free) to make some adjustments when our cable service was having issues.