If your speeds seem inconsistent, the issue may not be your provider at all. Your router location, interference from other devices, and overcrowded channels can wreck wireless performance even on a solid connection.
Quick wins
- Move the router out of a corner or cabinet
- Keep it away from thick walls and metal objects
- Update router firmware
- Split devices between 2.4 GHz and 5 GHz when appropriate
- Replace very old hardware if it is choking your network
Wi-Fi problems usually feel mysterious until somebody actually looks at the environment and setup. Then it gets a lot less magical and a lot more fixable.