How long should I wait till I contact my ex?

Do I do the 30 days rule or wait to contact her on her birthday which is on March 8th?

I want to try and get her back. She is currently in a new relationship.
1 month
On her birthday
Other (leave an opinion)
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+1 y
I need to make myself more clear because people seem to misunderstand. Right now she is in a rebound relationship, she wants us to stay as friends but I left and gave us some time and space, the no-contact period and now all I am asking is how long should I wait to contact her and continue our friendship because our relationship is no more.
Updates
+1 y
We accidentally bumped into each other and we talked. No hard feelings between us, both of us are healing and turning our life around. We might be friends, we don't know yet. We will give each other time and space to heal and to work on ourselves first.
How long should I wait till I contact my ex?
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