hey!
I spent numerous of my birthdays alone, so here's what worked for me
1. make a playlist of your favourite songs. literally every song you ever liked from when you were 10 to now.
2. go to your favourite place, but if you don't have one then just go to a park or a museum. I love people watching while listening to music.
3. book a spa day. that one I haven't tried but sounds fun. spa is better in solitude anyway.
4. eat your favourite food. honestly a game changer lol food is the most amazing thing we as species have created.
5. do something you enjoyed as a kid. painting, blowing bubbles, making sand castles. it makes you feel so good, like you're reconnecting with something that's been asleep deep inside you.
6. if you're not scared to talk to strangers then talk with someone you don't know. at a pub or in a line. could be fun.
happy early birthday!