Here are some ideas on how to improve your home Wi-Fi:
1. Check the placement of your access point (AP).
A location that is higher and to the center of the house should give the best coverage.
2. Do a quick survey and choose a wireless channel that is less occupied.
For 2.4 GHz networks consider using channels 1, 6, or 11, to avoid overlapping. As for 5 GHz, the channels are spaced further apart so overlapping is less of an issue.