Thanks for confirming it's your ONT.
I see three phone lines attached to it. The typical residential ONT supports one or two lines, not three. I'm not sure if there's a newer model of ONT for users with more than two phone lines. Maybe others here can comment.
You should run the Verizon speedtest (»
www.verizon.com/speedtest/). If it comes back with poor speeds, the Verizon support people will look at it. They won't pay much, if any, attention to PingPlotter or other speed tests you've run. That said, you should start a discussion with »
Verizon Direct to get them investigating.