How do I unlock this disabled phone

Start here: If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

traying to fixs my phone it says disable

Read ckuan's post. Click on the link for the instructions. The blue letters.

How to undisabled your iPhone 8+

Read my post, which says to read ckuan's post, which has a link for you to read, to get the instructions on how to deal with your problem.

Isn't it futile?

Some Poster thinks it will fixed itself just by posting.

I believe that every day.