I checked a video from parts people on how to replace internal card. It was a little bit more complicated than I had expected. So I rolled back my Win10 upgrade to 1909. I did a few speed test (generic) with N7260 and also to my specific carrier.
I then bought "TP-Link USB WiFi Adapter for PC (Archer T4U Plus)- AC1300Mbps Dual Band Wireless Network Adapter for Desktop with 2.4GHz/5GHz High Gain 5dBi Antennas, Supports Windows 10/8.1/8/7, Mac OS" from Amazon. Even though it may work the Microsoft Driver, I installed the TP-Link Driver from their website (they gave a CD too but the driver was older than the website).
Did the same speed tests with this USB 3.0 external WiFi card - Got pretty much the same results! Disadvantage - if you move around a lot, you need to take this everywhere. You could buy one of the other small dongle that stays with the laptop. I pretty much use my laptop like a desktop so this was a perfect solution for me.
I have since upgraded Win10 to 20H2 and disabled my N7260.
I also found a cheap Airlink 101 dongle from inside of my drawers (2.6 only) - I could use just in case if I have to go somewhere with the laptop.