i don't understand the obsession with high internet speeds. I am a power user and i only use basic 30 mbps service. Good enough to stream 4k youtube videos + multiple videos simultaneously. No problems whatsoever with multiple zoom meetings and videos running concurrently.

They key is your router. Invest in a quality router. If you router cost RM150, then expect poor performance but if  your router RM1000, then naturally the performance is better la.

Then you need to know how far you are from your router if you use Wifi. Even 10m away from router starts to be too far and you get some spinning wheels once you start to stream 4k videos.

ISP Free router is rubbish even in both wired and wifi mode. The  cheap processor inside was not designed to handle the high traffic and multiple users. You can keep that as a spare in case your main router fails.

You can try to connect a wired LAN connection to your router to see if you still have problems. If LAN is okay then problem is with Wifi not your internet service.