All ADSL2+ services, the Upload sync is up to 1 Mbps only, hence, the speed test results that you've provided shows that you're getting an acceptable upload speed.
We had a look at your connection and it shows that you're apparently using too much upload which causing your slow speed. Are you currently uploading a large file or updating your operating system?
Most of the time, cloud applications such as iCloud, Google Drive, One Drive, etc. are causing high upload. Other cause includes automatic system upgrade.
If you have multiple devices, you can try to leave a single device connected to the internet one after another then run a speedtest until you figure out which device is causing the high upload traffic.
Let us know it will go.
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