1. Take and save photos and videos: Taking and saving photos and videos of your parents can help you often recall their appearance and daily life after they left.

2. Editing family photo albums: Editing parents' photos and videos into family photo albums and adding some memories can make you feel their existence more truly when you miss them.

3. Keep parents' things: Keep things that parents used before their death, such as clothes, jewelry, books, etc. Let you feel their breath and existence when you miss them.

4. Participate in charity activities: In order to commemorate your parents, you can participate in some charity activities, such as donating money and volunteering, so that your actions can be a continuation of your parents.

5. Regular worship: In traditional culture, ancestor worship is a way to express filial piety and nostalgia. You can choose to worship your parents regularly to show your respect and memory for your parents.