If the computer end is fixed and the signal is still weak, look at the router.

Two bands.

Most routers send two signals. The 2.4 GHz band reaches farther and is slower. The 5 GHz band is faster and does not reach as far.

If your computer sits far from the router, it may do better on 2.4. If it sits close, 5 is better. Many routers join them under one name and choose for you. You can often give them two names and pick.

Where the router sits.

A router in a closet, behind a TV, or on the floor makes everything worse. See Where You Put Your Router Matters More Than You Think.

Extenders.

A Wi-Fi extender picks up the signal and repeats it. It is only as good as the signal it picks up. Put it where the signal is already strong, halfway to the dead spot, not in the dead spot.

Most extenders also cut the speed. They talk to the router and the computer on the same radio.

Mesh.

A mesh system uses several units that talk to each other. It covers a whole building better than one router. It costs more. If the whole building is weak, mesh is the right tool. If one desktop is weak, Part 3 or Part 4 costs less.

Evenings.

If the problem comes at night, not the signal, it may be congestion. See Why Your WiFi Slows Down in the Evening.

When to call.

If you have measured, moved the antenna, and still drop out, call me.

I can check the Wi-Fi card, the drivers, the router settings, and the building together on your screen, then tell you what to buy before you buy it.