Birthday with no friends

My birthday is in 2 days and nobody is available to celebrate with me.
I planned ahead to party or get coffee with friends but they are busy with their families and work.
I try not to be sad and plan on making the most of it even if I’m alone and no restaurants/theatres/spas are open.
Could you please help me find thoughts about it that will help me make it a memorable day? Is there a specific resource I can use to cheer myself up? Thank you!