Higher than normal latency

Hey there.

I'm facing higher than normal latency for the past couple of weeks.

My ping is generally less than 180ms, but lately its been more than 280ms.

I've contacted my ISP and the technician tried the following things:

1. Resetting my internet from their back-end.
2. Came over to my house to check the router, and performed a router side reset & reconfigured it.
3. Tested other things which I don't quite know what.

None of the above resolved my ping issues, and we concluded that this might be a Warmane side issue.

Things that I have tried:

1. Removing all other wireless devices from my Wi-Fi network and testing.
2. Several router & PC restarts.

None of these worked, and my ping is still a high average of 275.

Here's the link to my CMD Ping to our realmlist: https://imgur.com/xrvrCgR

I don't think this is an addons issue either as my CMD ping should be much lower than my in-game ping in that case.

Any input is appreciated, thank you.

-Thark