The answer to 'my retaining wall looks bad' is that there could be several common causes, such as poor construction, settling or shifting of the wall, damage from weather or water, or deterioration over time. Symptoms may include cracks, leaning, bulges, or gaps in the wall. Solutions can range from minor repairs to complete wall replacement, depending on the severity of the issue.
In general, minor repairs like sealing cracks or adjusting the wall may be possible for a DIY homeowner. However, if the wall is significantly damaged or unstable, it's best to call in a professional landscaping or masonry contractor to assess the problem and recommend the best course of action. Trying to fix a major retaining wall issue on your own can be unsafe and lead to further damage.