Existing customer options

I am trying to confirm existing customer options for Xfinity internet.  I am having a Fiber service provider move into our area, and am seriously considering switching away from Xfinity, especially given the large cost difference.  Xfinity has reasonable new customer deals with a 5 price year guarantee, but these aren't available for existing customers, making the fiber provider the best option.  Our neighborhood also had a series of outages earlier in the summer, with about 10 in a month, not including weather or maintainence issues.  I was able to request a credit for 1 day, but then the outage credit system started rejecting submissions and said I hit the max for the month (despite only getting a single credit).  I need to be shown any options that could make me consider keeping Xfinity, since I will now have another high speed internet option available shortly.