Thanks for posting and a warm welcome to the community.
Sorry to read that you are having issues with your wireless speeds.
From checking your connection, the downstream power levels are too low and the upstream are too high. As this can have an impact on your broadband, I would like to arrange an engineer appointment to adjust these for you. I've sent you a PM (purple envelope icon, right corner) with some details for you to confirm please.
This may or may not be the main cause of the issue, have you tried speed tests through a wired connection to see if there is a difference?