first thing to do, login to router webpage.

set 2.4 + 5 ghz security to wpa +wpa2 only...AES method .

if not you will face intermittent disconnection from the router. unless most of your home device supports wifi6 and above

Band steering is combination of 2.4+5ghz, the one thing when you turn this on, the router will always try to assign 2.4Ghz to you even if your device is very near to the router/node, not sure if is the firmware fault or settings.

How I usually trick the router in to giving me 5Ghz always is that I adjust the signal strength for 2.4Ghz to the lowest or middle, but that would also mean your CCTV cameras will have lesser coverage range.

What is your routers firmware by the way?

I would like to clarify abit.
Price for SWU 4.0 (500mpbs) is
1. RM149 monthly without 6 month bill waiver (don't need unifi mobile) or
2. RM139 monthly with 6 month bill waiver (but need to add on unifi mobile for 2 months). 

Am I right?