If you want to live in a kind of heaven beyond this when you die, you must first believe in the possibility of it first, and that it is possible such a place exists, etc. And next, you have to believe in the possibility that Jesus went there, and is maybe still alive now, and is listening to all of us right now, and is fully able to be hearing all of us each individually right now, etc.
And then next, you have to try and talk to him while being 100% honest with both yourself and him as you are talking to him, or when you do talk to or with him, etc. And when you do, be 100% honest about your unbelief, and what you are having trouble believing in, and maybe perhaps why, etc, maybe saying or adding things like "if you are really there" or "if any of this is real or true" or "if any of this is not just really stupid, or is not just really foolish, or is not just really stupid or foolish or is in vain right now", etc. Just be 100% honest with him, etc, because that is all of what he is really looking for the most anyway, etc. And let whatever is within you lead as you are doing it, etc, and just be honest, etc.
Next would be the issue of sin, etc. And with sin, no matter how much you believe or don't believe in it or not, just ask for forgiveness of the sins that you already know or feel are sins against your own conscience that you can know or feel sometimes as you are doing them/it, etc, and ask him to forgive you for that, or all of those things, etc.
And then after all of that, finish or close your talking to him, or your prayer with him, and then just go about your daily life as you normally would after that, and see if you notice anything different, or that might be changing, etc. And if nothing seems to be any different, or nothing is seeming to be changing, then just try this with him again from time to time until you maybe do start to notice some things changing, etc, and this will be a very good start for any of you, etc.
Oh, and ask him if he would please help you with your unbelief, and would let you into heaven when you die, etc, with maybe adding 'if any of this is any way real of true", etc, and ask him for his help for you in confirming or being able to believe that sometime before you die, etc.
God Bless.