Entire party dropped out of a two week cruise including roommate. Tips for solo female cruiser?

Pretty much the title, family booked with me but somewhere along the way they couldn’t afford it and just didn’t tell me. (I’ve had a few weeks to be disappointed and am over it now). I’m still excited for my trip but this is the longest cruise I’ve booked and the first time I’ll be traveling alone. What should I do about the missing roommate? I think I’ve read here to just leave the person on the booking? Is that correct? Feeling a bit nervous about dining, safety on and off ship, and finding other solo travelers hopefully close to my age (30s) but not looking for anything romantic. Open to any advice!