I don’t know my Apple ID
I can’t download apps cause I forgot my Apple ID and password
Marking your own post as Solved may prevent others from trying to help because they think you have fixed your problem.
See if you can recover the ID/password. Use every email address you can think of.
Apple ID - How to find your Apple An iCloud e-mail address is an Apple ID.
If you forgot the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.