Biologically it is completely random and depends on the sperm, there is no medical diet or position that can change it. Focus on tracking your ovulation for a healthy conception instead.
When we were trying, I had thyroid issues so my doctor advised me to just focus on regular checkups. Boy or girl, a healthy pregnancy is what we should pray for.
Haan, honestly baby boy or girl doesn't matter na, a healthy child is all we need. Scientifically there is no trick to choose gender, everything is in God's hands.