How do I re establish my relationship with God?

read the bible, pray to God everyday,

James 4:8 Draw near to God and he will draw near to you.

Double down on the religious lies.

Make a sincere covenant with the Father that you will always obey all of Jesus' sayings .

Check it out
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Though I do not know why anybody would want to do that, the general technique goes like this:

Whenever something good happens, thank god. How ever hard you or others worked for it, thank god.

Whenever something bad happens, it is your own fault or somebody elses fault or bad luck or just coincidence or whatever. God has nothing to do with it.

If you live by these two simple rules your brain will associate god with only good things. This should easily increase your belief in god a lot. It does not make god real, it will not get your prayers granted, it will only increase your belief in god.

This methods works the same with all kinds of gods. You can apply it to Zeus as well as to the christian god or to the Flying Spaghetti Monster. The effect is the same amazing feeling of being close to the deity of your choice.

Read the bible

Stop. Look. Listen. Don't forget to stop.

Don't mistake the lack of a god in your life as a sign that you've done something wrong. When people think theirs a god in their life, they imagine the interactions, the "presence" is all imagined. So maybe you've noticed the incongruities between what would happen if there was a god in your life and how your life is. That doesn't make you wretched, or stupid, just that maybe you're getting over wishful thinking.