If you are having wireless issues throughout the house then yes switching to an Eero system will definitely help speed things up.
If you have any devices that are hard wired to your modem / router, how well does that device perform online with the wired connection? If that device is also slow you are going to want to upgrade to a cable Internet Service provider if possible. You can visit fast.com to automatically start a speed test, once you have the download speed test results (in Mbps), you can click “show more” info to reveal the upload speed test along with the response time. Please share those numbers with us or compare them to the plan you are paying you currently paying your Internet Service provider for, as they may not be delivering what you are expecting.
I hope that helps you out, let us know if you have any more questions.