Dreams are not a clear sign

According to what you’ve described—the repeated occurrence of the same dream, then seeing it again after making duʿā’, and even finding similar themes when opening the Qur’an—these things may appear to point in one direction. However, in light of Islamic teachings, they cannot be considered a definite or certain command from Allah.

That said, it can certainly be said that a sense of goodwill and concern for the guidance of your friends has developed in your heart, and this in itself is a very good and commendable thing.

Therefore, if you choose to contact them again with the intention to:

speak in a good and respectful manner

convey the message of Islam with gentleness and wisdom

avoid any pressure or force

then this action is permissible and may even be rewarding.

However, it should not be taken as a compulsory sign or an obligatory duty. It is better that you perform Salat al-Istikhara, and if you then feel content in your heart, proceed with balance and wisdom.