Hi 👋,
if you blocked your card there is no way to un block it and you need to request a new one.
If you instead froze it, just un freeze it.

https://together.bunq.com/d/3509-whats-the-difference-between-freezing-and-blocking-a-card

https://together.bunq.com/d/50479-how-do-i-unfreeze-my-bunq-card

Good luck 🍀
GG