6 Of my photos were rejected. Now I wanted to ask the community before. Is there something I can do to avoid technical problems?
It's generally better to share 1-3 images which were already rejected, and the exact reason given in each case. Speculating on future acceptance is less what we do here. Bear in mind we are not Adobe staff, so we cannot see your previous picture history.
Carefully inspect every image at 100-200% before submitting, looking for artifacts, soft focus, chromatic aberration, haloes around edges, etc. Also look at the histogram to be sure you have no blown highlights or underexposed shadows. In the image that you've uploaded, you have both underexposed shadows and blown highlights - those white areas where there is no detail at all. Blown highlights cannot be repaired; many other issues can be fixed with skillful editing in Lightroom or Photoshop. These requirements are spelled out in the User Guide:
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If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html