How do I get my self worth back after a bad breakup?

I know I should never put my self worth into other people, but I give them a lot of my time, effort, money, and energy cuz I care about them. So when I have a breakup or even with friends not being there for me it really messes me up. How do I get my self worth back especially after a bad breakup and keep it?

How do I get my self worth back after a bad breakup?
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