Thanks for your response. I believe yours was approved. Congratulations! Regarding mine, I will self petition (with no lawyer) and also have an expert opinion letter from the US. Personal statement is not a compulsory factor to include but I want to support my endeavor's substantial merit and national importance. First of all, I want to find an effective endavor. Compared to STEM areas, this is the main problem for non-STEM areas (like mine). In STEM, it is pretty straigthforward, explaining exonomic impact, sustainability, increasing productivity, supporting health services and saving billions of dollars, etc. However, for us, it is less concrete.