sanDisk Extreme USB 3.0 flash drive 64 GB is not accessible

I think you have done everything possible alifahmy.  If the drive is not accessible no software will access it else I would suggest running a CHKDSK on it.

You could try using some emory paper on it’s contacts and the jack’s contacts that you are plugging it into.  LIGHTLY.  This to remove any oxidation or smoke or dust that might have gotten on them.

Other than that I think the drive may be at EOL.