Is it necessary for the choice after Istikhara prayer to align with one's inclinations? And what if the indecision persists after repeating Istikhara? Does excessive thinking about the future after Istikhara indicate a lack of reliance on Allah?

The person performing Istikhara should proceed with the matter for which they sought guidance, relying upon Allah Almighty. If it is good, Allah will make it easy for them; if it is otherwise, Allah will divert it from them. They should be content with Allah's decree and destiny. If they remain in doubt after performing Istikhara, there is no blame upon them for repeating it until their heart feels at ease. They must entrust their affair to Allah Almighty, trust in His excellent management, and be content with what He destines.