If this is not enough and the signal remains poorly received, you will probably have to invest in a repeater or a mesh router. The first amplifies the signal then sends it back to the router: it retrieves the flow of your existing WiFi network in an attempt to extend it. But this type of solution will strengthen the signal, but still lose bandwidth, which will impact the quality of your connection. The second device, on the other hand, is a repeater which also has a router function: it will allow you to create a second network, relaying the signal through several satellites (strategically placed in the house via Wifi, CPL or even Ethernet), in order to broadcast WiFi throughout your home. Focus more on unifi broadband plan in malaysia essential there.
Notable Option
it should be noted, however, that using 4G in the event of an impasse does not necessarily mean that you will cause saturation of the mobile network at the local level: if you do not live in an urban area, but in a rural area, where the housing density and the number of users are lower than in cities, the risk will obviously be much lower of overloading a relay antenna during these times of confinement. To choose between your personal Wi-Fi and 4G (if you use a smartphone, or if you want to create a Hotspot), again test the speed of each network with Speedtest.
Limit connected devices and uses
To improve your Wi-Fi connection, also keep in mind that a router will always have a limited speed, and the more devices you have connected, the more bandwidth you will share, and the slower it will be. If your network works fine under normal conditions but is currently slow (and it is not the ISP), it is probably because several smartphones, game consoles, laptops, TV or tablets are connected to it at the same time.
Conclusion
It is up to you, as far as possible in this context of confinement, to limit the number of devices connected to your Wi-Fi network. First, by setting usage limits, for example, forbid your children to watch movies on Netflix while you are making a video conference, or when you have to download or send a very large file.