internet speed beyond slow

Hi, 

Over the last few months, I have been having issues with my internet speed.  I work from home and zoom is constantly telling me that my internet is unstable, dropping and or completely not working.  I have been running the speed test every day and the attached is very common throughout the day.  I have rebooted my computer, the router and unplugged and rebooted the modem multiple times.  Sometime it may help for an hour or so and then it goes back to this.  I am on the superfast plan and suppose to get up to 1.2 Gbps but am far from it.  Who can I work with on this?

Thank you,

Ely