God is a person. So naturally you get to know him (or "reconnect" with him) just like any other person. You talk to him, listen to what he has to say, spend time with his people (fellow Christians), and obey him.
Granted, God is a person unlike all other persons. But God is, so to speak, the archetypal person. So there are points of analogy, but also points of disanalogy. You can't touch God like you can touch most other persons if they are in your poximity. Most people focus on the disanalogy and get themselves really confused about how they know God. They'll think something like "But if I can't touch God how can I know him like other persons?!" Well you can't touch me either (or see me or smell me... which is your loss). But it doesn't need to be that complicated. The basic *way* you know God is the same basic way you know other persons.
And just like any relationship there are things which draw us together and things which draw us apart. Sin separates us from God. It's a wrench in the relationship. Sin doesn't just put us at odds with God relationally, it also puts us at odds with God epistemically. "Reconnecting" with God will involve dealing with that wrench. As you know, God has already dealt with this problem and you only need to respond appropriately to it.
From an epistemic standpoint, if you're finding it hard to believe, be like the father why cried out "help my unbelief" (Mark 9:24).
Just like with any person, we don't always "feel God's presence." Think about the people you met today. Did you get a tingly sensation each time you met them or interacted with them? I doubt it. As you read this (if you do) you and I are communicating. But I doubt I'm giving you a tingly sensation... I hope I'm not anyway.
I wouldn't be focused on working up feelings if I were you. If you had a wife and your love life started going dry it wouldn't do you much good to close your eyes, hold your breath, and try real hard to make the "love" sensation pop into you. That's not how it works with real people, so why think it's how it works with God? If you want to rekindle your love life, spend time thinking about the person, what you like about them, what they do for you, spend time with them etc.