I’m sorry to hear that. Death sucks… A couple people I graduated with in 2017 died within a year, including one close friend. It isn’t fun. However, I think it’s taught me to appreciate every moment with those I love and to make the best of my time with them, knowing that it could always be the last time.
I may be autistic, but as someone with my own loss, this was also the most important thing I’ve learned from it. The best thing one can do is treasure the people who are in your life, even if that number is small.