Recontracting, need help with configuration

So currently, I'm using a 2Gbps plan (contract from 2 years ago) from Singtel. Read through some threads saying this plan is ****. Thinking to change to the 1+1Gbps Gamer Bundle but no idea if will support my home. Used to having weak WIFI to master bedroom, but now weak WIFI to all bedrooms and also keeps disconnecting. Also started to have random lag spikes when gaming.

I only have 1 ethernet port in the DB, and another by the living room. All other ports in the room is telephone port...

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