Repairing a Cracked Concrete Retaining Wall

I noticed several significant cracks appearing on the surface, and I'm concerned about the structural integrity of the wall.

I'm looking for recommendations on the best approach to repair these cracks and ensure the stability of the retaining wall. Should I consider a DIY solution or hire a professional contractor with expertise in concrete repairs? While I'm comfortable with basic repairs, I want to make sure the job is done properly to prevent any further damage or potential collapse. What materials, techniques, or tools did you find effective in repairing cracked walls? Are there any specific factors to consider, such as drainage or reinforcement, to ensure long-term durability?

Thank you all in advance for your support and advice.