How do I start praying again?

I’ll summarize this as best I can.

I was raised Christian (Methodist, idk if that matters). We didn’t go to church every Sunday, I wasn’t raised strict but I grew up believing in God and knowing the stories of the bible etc. I would consider myself spiritual now, I guess? I believe in a higher power, I call Him, God.
My issue I’m having is a don’t feel close to Him anymore.
3 years ago, my beloved dog suddenly got sick and passed away. It happened quick and there was the expectation that he was going to be okay, and in an instant, he was gone. While he was hospitalized I prayed and I prayed and I prayed. I b e g g e d God to let my dog make it through, and as I mentioned, very quickly he passed. I didn’t even get to say goodbye. I’ve never felt heart break like that before. I was so angry with Him for taking my dog. Some time has passed and I find myself wanting to pray again and I can’t. I just can’t. There’s like a brick wall and I just can’t do it.
I guess what I’m asking is can someone please explain to me why God let this happen? How do I forgive? I am not perfect, no one is. I want to move forward and try to rebuild a relationship with Him again but it’s just so hard.
Please don’t judge me, or be harsh. I’m genuinely seeking answers.
Thank you.