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FCC chair wants to boost broadband standard to 100Mbps
(www.theregister.com)
This is a most excellent place for technology news and articles.
Do you have a clear and direct view of the tower with nothing like walls, trees, or buildings blocking it? Did you make sure you're actually getting a 5G connection? These Verizon boxes will drop down to LTE or even 3G without telling you, if you don't have a reliable signal.
Don't put up with a crappy connection. Go to http://192.168.0.1, and make sure that it's showing "5G UW" and at least 3 bars. If not, power cycle the gateway and see if it's able to grab a 5G signal then. Failing that, you're going to have to reposition your gateway. Call Verizon and have them send out someone if you need help. Explain to them that you're getting a only 18Mbps and they'll help you out. They won't even charge you for the service call, either, unlike other ISPs. So you've got nothing to lose.