Do not keep your router close to a cordless landline phone as they have the same frequencies.
Do not keep your router in a closed space.
Keep your router far from walls (preferably center of the room).
Do not keep your router farther than 7 feet of your PC/ Laptop.
Do not run background applications on your computer/ devices, as it can affect speed.
Install and update anti-virus on your computer.
Limit the no. of devices on your Wi-Fi connection, less devices means faster speed.
Try to not access content outside the country or websites that control the speed of your internet.
Ensure regular maintenance of your Wi-Fi router for consistency.