I’ve been trying a shotgun approach, where I just write out all the negative self worth statements I can think of, then one by one remove them just in case they’re floating around inside me somewhere.
Another thing you could try is to find high-quality, reliable beliefs from wise people, and think to yourself what would the opposite belief be, then write all them out and try removing them also before installing the wise beliefs. One idea I had right now might be the book of Proverbs in the Bible, that has lots of negative/positive belief pairs.
Another I’ve been planning to install is a list provided by Dr. Jordan Peterson, a recently famous intellectual, located here:
https://www.quora.com/What-are-the-most-valuable-things-everyone-should-know/answer/Jordan-B-Peterson