An innovative way to repair a tilted retaining wall is to use helical anchors. The upside to this method is that you won’t need to tear down and restack the blocks. However, you’d need to hire a specialist and it’ll be expensive. The most common approach is to remove the blocks, regrade and relevel the base, and reinstall the blocks row by row. While doing this, be sure to use a level on each row to ensure it’s flat.