Awful speeds after switching to Magenta plan.

I've been a T mobile customer since their VoiceStream days. Thats 18 years almost. Back in Dec my parents wanted new iPhones from the costco deal so we jumped on the offer.

That meant for us to switch from our Simple choice family plan which had free international data to the magenta one plan.

Since then I've had nothing but slow speeds on 4glte. Seeing all of those commercials on tv just anger me. I mean look at these speeds. http://imgur.com/a/vNo7kPP

I've called support but all they have me do is reset my network settings which is annoying because it deletes all your wifi information, contrary to what they tell me over the phone. Any ideas what I can do to get better speeds? I love in the northern VA area, so it's a very big market for t mobile.