Should I dye my blonde hair black??

Back in December, my friend and I dyed the bottom layers of my hair jet black. At the time I was really scared to do it because I'm a natural blonde and very pale so I thought it would wash me out but I loved it.

Now that it's been a few months, I think I want to dye the rest. Instead of dying it jet black like I did the first time, I'm thinking a black-brown since that's what my hair has faded to. Last night I put all my blonde hair under a beanie, leaving the dark out just to see what it would look like and I really like it but I'm still nervous. I'm worried that it will be too much and I won't be happy with it. A few people have told me to just do it but I'm still on the fence. Idk if I would look good with all dark hair and I know once I do this, it'll be a pain in the ass to go back lighter.

People who have dyed their hair really dark/ black, did you regret your decision?