Poor internet service Samsung s20

Hi I have a Samsung s20 and I've noticed other people on this forum had this issue. I was unable to find any posted solutions so I'm coming here for help. Like other users stated this issue is only prevalent on my phone and the app only load if I switch to mobile data. I have no issues and loading and running applications on my laptop. Also my phone apps loads fine when I connect to different network such as my company wifi it only seems to be an issue specifically my home network or Xfinity since the city I lived prior didn't offer Xfinity. I just started using Xfinity in August so my networking equipment is brand new it is a Netgear nighthawk ac1900 modem router combo. My apartment is 800 sq/ft and the most at given time is 4 devices which consists of an iPhone 15, Samsung s20, Reolink doorbell, and MacBook pro M3. When I first moved in and only had my phone connected it was just as bad so it's not a bandwidth issue. Doesn't matter if I'm on the 5GHz or 2.4 GHz network or mobile data is off both don't load certain apps or websites. Nor did I see any improvement when using my phone within closer proximity to the router, relocating and raising the router to reduce interference,  rebooting the router, switching to a public dns, disable traffic meter, forgetting and reconnecting to the network, or changing my MAC from randomized to phone MAC. Running the internet speed test I get 353 Mbps down and 23.7 Mbps on wifi and on mobile data I get 199.6 Mbps down and 15.9 Mbps up. Only on mobile data am I able to use YouTube, Signal, banking applications despite the Wifi connection speeds being better and it  won't  load these apps and others. I'm certain it is something on the ISP side and it's been this way since I got Xfinity but I'm sick of draining my phone battery using mobile data and would like this fixed.