Leaning mature arborvitae

View attachment 404019 View attachment 404020 View attachment 404021 View attachment 404022 These arborvitae have been here for years. They are 12-15’ tall now. They are leaning and have evidence of being previously staked. The owner recently had someone try to upright them. I see below one that they did some digging and mounding up dirt to push it over.

The root ball is solid. I don’t see that staking will alleviate the problem. Am I wrong? What would you recommend?