How to be happy (alone) and the best me possible?

Sara
I am definitely going through a big transition and I am ready to find myself. I'm ready to be happy, independent and ME. Any tips on how to do that would be great. A little bit about me.
-Just got out of a 6 year relationship. We were also engaged
-I will be 27 at the end of the month 
-I have my first apartment but I can't stay there because being alone in a unfamiliar place freaks me out (I literally sleep at my sisters in her bed)
-I work from home
Anything else, just ask. Thank you so much ladies ☺️