1. Test the baseline
Run a test next to the router, then in the room where you have problems, and save both. If the speeds differ a lot, the fix is Wi-Fi coverage rather than your plan.
2. Place the router well
Put it central, high up and in the open, away from metal, mirrors, microwaves and thick walls. A router in a cupboard or at the edge of the house wastes a lot of signal.
3. Use the right band
2.4 GHz reaches further but is slower and crowded. 5 GHz is faster over shorter distances. 6 GHz (Wi-Fi 6E and newer) is the least congested but has the shortest range. Use the fastest band that still gives a strong signal.
4. Reduce interference and load
Choose a less crowded channel, restart the router periodically, and disconnect devices you are not using. Pause backups and updates during important calls.
5. Fix the biggest weak spots
For dead zones, a mesh system or a wired access point works far better than a basic repeater. Where possible, connect fixed devices such as TVs and desktops with Ethernet to free up Wi-Fi for the rest.
6. Keep equipment current
Update router firmware. Older routers and devices limit speed for everyone, so a modern Wi-Fi 6 or newer router often makes a visible difference on fast plans.