The best way to value ourselves is to remember, and bask in, who God says we are and how much God values us. If we stay grounded there in that Great Love, it becomes less and less likely that we will devalue ourselves or allow others to do so.
This is an old talk by Henri Nouwen which I think will help you, as his words have helped me, to stay connected to who God says you are. It will strengthen you in all your inner and outer dealings in this world. I listen to the entire thing at least once or twice a year to refresh my memory and keep me strong.
In case you don’t know who Henri Nouwen is, he was a grace-infused human being who lived and worked among the L’Arche Community and said that these lovely people taught him more about God’s acceptance than anyone else. He said this was due to the fact that they did not know or understand anything about his degrees, his accolades or his accomplishments (let alone his failures and weaknesses), but only knew him by his heart.
Believe me, time listening to these words will be time well spent.
Wishing you God’s peace & security…