Is there any way I can update macOS to Catalina after I used ignore command in terminal I used this command

sudo softwareupdate --ignore "macOS Catalina"


Now, it is not showing any update, nor downloading from app store. How can I fix this issue to update to macOS catalina.
You can undo the command with

sudo softwareupdate --reset-ignored


You should also be able to use

sudo softwareupdate --fetch-full-installer


to get the Catalina installer.

See also https://mjtsai.com/blog/2019/10/15/catalina-software-update-can-download-old-installers/