Assalamu alaikum
Thank you for your question. Regarding istikhara, it is important either you have to do it, or the person to whome you are related to closely or you know her/him. This is not the best way you ask any imam whom you don't know personally. I advise you that you yourself try in this field and Allah will help you. You may try more than one if there is no clear result.
Wassalam
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