The first thing you need to do is restart the router and take the stats immediately afterwards. Only do this once, for now, not several times if nothing changes. Note that even if the stats change, for now your download speed will not increase.
Mini-explanation - Your connection has been up for a month. All sorts of short-term noise events can cause a disconnection/reconnection at a low speed. At that point the noise margin is reset to the connection-time setting for your line.
Then the noise stops so the margin rises.
You have the low speed, a high margin, and in fact an ADSL2 connection not an ADSL2+ one. Classic symptoms. This does not self-correct, you have to do a manual reconnection.
Longer explanations on my website - particularly on the Troubleshooting >> High Noise Margin page.
My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost
. Internet connection -
IDNet Home Starter Fibre.