Do you have “former employees” or “alumni”
Former employees are just people who happened to work at a company.
Alumni are people who were members of an institution — maybe a family.
Alumni worked with you for a while and came to the end of their time with you — but still appreciate the experience and identify with the organization. They are proud of their participation and contribution. They’ll still wear your logo.
The existence of proud alumni might be the best indicator of a long-term awesome corporate culture.