My hairs naturally blonde and I've been dying it brown shades for about a year now, as my regrowth goes blonde I've gotten darker and darker with shades so it now looks black. I'm considering bleaching it myself but I'm unsure whether I could do it right.

Any tips or recommendations on what I could do? I just want to go back to a lighter brown.

I have the same problem, so I read a lot on this topic. There are the so called removers( like Prell for example), that can wash away the dye and leave your hair lighter( hopefully you'll even regain your previous color back). I would recommend you to dye your hair after that, cause it loses its shine and becomes dull and brittle. Of course you could always bleach it, but be sure it would make it visibly dry and exhausted. As the removers are concerned, they are ammonia - free, so they won't damage the hair. Hope it was helpful enough. Good luck, tell me how it went:)