Gender influence techniques

Anyone try any techniques to try to conceive a girl? I have 2 boys and love them to pieces, but would love to have a girl next! I’ve read all about it online. Mostly says to have sex 2-4 days prior to ovulation if you want a girl and on the day of ovulation or after if you want a boy. I’ve also heard that shallow penetration leads to a Giel. Has anyone tried anything and did it work??