Help with character background

Hello. I'm creating a DnD character, but I'm having a hard time making a good background story. This is what I have:

- Race/Species: Gnome - Class: Warlock - Sex: Female - Age: 67 - Skin: Dark brown, with wrinkles - Eyes: Yellow - Hair: White, long, with braids - Height: 3.9 feet / 119 cm - Background: Noble

No siblings, no children, never married. She grew up in a fantasy place similar to the Caribbean islands, in a noble family, with loving parents, who were murdered when she was young.

She could never get over her parents' murder, so she turned to the occult to be able to communicate with their spirits. She made a pact with an entity from the occult in exchange for magic powers. She's not necessarily evil, but she's lived through a lot of sadness and despair, so she's tired and weary of people, but still feels empathy for others who are also suffering. Maybe a necromancer in flavor.

----------------------------------------- The pact she made to be able to use magic was in exchange for what? What does she owe this entity?

How old was she when her parents were murdered? How did she find out? Did she witness the murder or heard it from someone else?

She became an adventurer. She meets with other adventures (different races and classes), and they decide to journey together. Why was she adventuring? What do all these adventurers have in common that made them decide to travel together?

What else would you add to the background story?

Thank you!

Edited to fix typos.