I paid for subscribtion but I can't use any apps

If you paid in 2019 for the annual plan then are we not past the March 2020 period when the plan should have expired? However if the plan was renewed and still you have issues then try the steps mentioned in the following link
https://helpx.adobe.com/hk_en/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html
If it doesn't work, then you need to contact support.
Login to your account and navigate to the URL below. Make sure that the browser has cookies enabled, and all script blockers are disabled.
https://helpx.adobe.com/contact.html
Click on the chat icon on the bottom right, and type AGENT to avoid bots and talk to a human.
Also, be mindful of answering anyone who sends you a private message. See the following for more information about scammers
https://tinyurl.com/y7cfrr7y
-Manan