If you want to contact a god to ask for help, you can use this one to contact the 4 highest ruling gods.
https://www.joyofsatan.org/www.angelfire.com/empire/serpentis666/Ritual.html
There is a part in here where you will get a very strong feeling that you are certain you are being listened to, this is the time to say whatever you wanted to say. Now you can explain what your problem is. Or if there was a different god who you specifically wanted to contact, in this time you can also ask nicely if that other god would be willing to come help you. Explain what the problem is. Say thank you. Then the ritual is over. You can sit there and be relaxed for 10 or 20 minutes and focus on the electric feeling in your body from the god's energy.
If it is one of the gods who now has a specific ritual of the ones Egon posted, it would also be a good idea to do that ritual. It is a way of saying thank you and giving help back. And the largest effect that those rituals do is they build a stronger connection between that god and our people, and between that god and yourself. So if you asked that god for help, he will be more strongly able to help you by you doing the ritual to strengthen his influence on your life.