Kindly refer to the following link(s):
Making dua after prayer on your own or in congregation
Can I make dua after salah when praying on my own? Introducing new things in religion
Dua After prayer an Innovation? | Sheikh Assim Al Hakeem
Best time to make dua in Salah
Best time for acceptance of Duas in Prayers (Salah) | Sheikh Assim Al Hakeem
Can we make dua in sujood of Fard & Sunnah prayers Can we say it in our own language
Proper way of making dua, must we recite durood before and after it?