Router hasn't been the same since DoS attacked

So my friends and I were playing Call of Duty on Xbox One. We were trying our hearts out and won against them 2 games in a row, in the middle of the third one of the group began DoS'ing us. Two of my friends were booted completely offline. My router was shut down completely. I had to call Comcast 3 times in order to get it sorted out. Finally after an hour and a half my internet was seemingly working properly

It was a major inconvenience, however my Netduma recorded the DoS attacks in the log and I have the IP's. I would post the picture on here but I'm not sure if that's allowed. I received numerous attacks every 5-10 seconds like clockwork for an hour. From Teardrop to Jolt2. This hasn't happened to me in years but it's sad that it happens so easily once an IP is acquired.

Almost 24 hours later, my Geo-filter hasn't detected that I have been joining a dedicated server, just peers located in or out of my range. I also have been getting a lot of players entering my game OUTSIDE of my range. Keep in mind this was not an issue prior to DoS attack. I was getting into dedicated CoD servers frequently as well as only having Peers within my range (500-1000 miles). Bear in mind, my settings are for filtered mode and strict.

I also have been suffering disconnects from Xbox parties which 95% of the time doesnt happen. I changed the router login as well as the wifi passwords. I would like to know my options on how I can get my expensive router to be working properly again since I invested in it, and I love it. Please and thank you.