What should I do if I miss my grandmother who passed away?

I also miss my grandma very much. I was raised by my grandma. It was not easy. My grandma passed away not long ago. She died suddenly. When I received the news, I cried. I couldn’t accept it. I believe I didn’t even say the last sentence~ It’s really sad. I can’t get out now. No matter what I do, I miss my grandma every day. I miss her so much. Every time I go back, my grandma is waiting for me not far from the door of my house. Now No one is looking forward to my return. Grandma's sudden death has been a huge blow to me. I feel that I have not fulfilled my filial piety. I feel that I am sorry. Grandma, I hope you will have no pain and only happiness in another part of the world