Its okay if Quran decided to focus on Abraham and its lineage , there are numerous saying of Prophet which says many Prophets were send and one way of looking at it where Monotheism is practiced/reference
Of course God is just and will not punish any one if the real message does not reach a tribe or community ( especially after last Prophet) hence Muslims are asked to spread/convey the message multiple time in Quran yet they have stopped reading/acting on it ( so they will be asked about it here after and will be judged/punish of the fact)
https://en.wikipedia.org/wiki/Monotheism
https://islamqa.info/en/answers/95747/how-many-prophets-are-there-in-islam
Some reference if you want to learn more
Prophet Muhammad (pbuh) in the Hindu Scriptures – The Vedas - Dr Zakir Naik
https://www.youtube.com/watch?v=6LClX8BR63A
Prophecies of Muhammad (pbuh) in the Hindu scriptures convinces a Girl to enter the fold of Islam