The answer to 'my retaining wall looks bad' is that there are several common causes, including structural damage, poor drainage, and weathering. Symptoms may include cracks, tilting, or bulging in the wall. Solutions can range from minor repairs to complete replacement, depending on the extent of the damage.
If the wall is only showing minor cosmetic issues like discoloration or small cracks, you may be able to address it with a DIY approach like cleaning, sealing, or re-pointing the mortar. However, for more serious structural problems, it's best to consult a professional landscaper or mason. They can assess the wall, identify the root cause, and recommend the appropriate repair or replacement strategy.