Q.Mohave yucca
I live in Palm Springs and have a Mohave yucca that tips over. One stalk last year fell over and broke. Now the tallest fell over and the wall broke its fall. I have it propped up, but I want to know, can I nurse it back to regain its strength to stand up on its own and what do I do at this point?

Your root structure is likely compromised from either root rot or drought conditions.
Root rot may not be recoverable, but if the plant is suffering from lack of water, you can water the plant to see it it can recover.
https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-leaning-over.htm