How to reset your MAC address to the original one?

So long story short I am an idiot, read somewhere changing my mac address would sort an issue im having and i just recklessly did it without knowing what i was doing or properly researching it.

I did not screenshot my address before changing it and cannot find my macbook's box. The whole thing is just a mess.

Is there anything I can do to go reset it to the original MAC address?

Any help will be greatly appreciated x

PS: I am fully aware I brought this upon myself and trust me I have learnt my lesson ahaha