How do I delete my family tree?? I have made some mistakes & I only can start over.
Because this is a single, shared and open-edit endeavor (much like Wikipedia), most things can't simply be deleted. The only exceptions are profiles that you entered that nobody else has touched.
But don't worry, all mistakes can be fixed! There are two broad categories of changes that you can make: changes to profiles (including merging with other profiles), and changes to relationships between profiles. When things are so messed up that people throw up their hands and want to start over, it usually means that the relationships are wrong. Once you get them sorted by moving profiles around like puzzle pieces, the correct picture will emerge, and you'll feel much better. :-)
Here are some Help Center articles to get you started:
Editing vitals: https://www.familysearch.org/en/help/helpcenter/article/how-do-i-change-vital-information-in-family-tree
Correcting spouses: https://www.familysearch.org/en/help/helpcenter/article/a-person-in-family-tree-has-the-wrong-spouse
Correcting parents and children: https://www.familysearch.org/en/help/helpcenter/article/how-do-i-correct-parent-child-relationships-in-family-tree
Inserting a missing generation: https://www.familysearch.org/en/help/helpcenter/article/in-family-tree-how-do-i-insert-a-missing-generation
FamilySearch Family Tree is a single collabortaive database we all share.
People don't have their own "private trees" like they do in Ancestry.
this is a great video to watch:
WHY USE FAMILYSEARCH FAMILYTREE
In short -- you simply need to correct the info you entered (if that is the reason you want to "start over"
see these links
Making changes within FamilySearch Family Tree
How to Correct Relationships
Correcting Mistakes in Family Tree