Slow Internet Speeds, Download Speeds and random drops

I am currently paying for 1GB download speeds and for the past month I have been lucky if the speed reaches 15mbps. I have tried troubleshooting my Gateway multiple times and the Xfinity assistant has been zero help with setting up a technician appointment to see they can fix our issue. It is getting so out of hand that we are nearing the decision of moving providers since fiber has been introduced to our neighborhood recently.