@Omarrr 

Good day,

Thank you very much for your time and patience.

May I know where are you located and who is your internet service provider?

Have you tried to reset the modem and set it up again？

Could you please also help me check the DSL info, such as current rate, maximum rate?—a picture would be highly appreciated;

Did the slow speed occur to both 2.4ghz and 5ghz, as well as Ethernet connection?

Thanks a lot.