You can't unblock yourself from someone else's profile unless you have access to that account on your own.
How Can You Get Someone To Unblock You On Facebook
Nonetheless, there are a few things that might make you feel better:
: > You can still check out whatever they post openly (as long as you aren't viewing it as/from the obstructed account). You just won't see what they post to good friends.
: > You can still view their public profile by seeing it's unique LINK (www.facebook.com/firstname.lastname, usually).
: > You can make a new profile and also hopefully add the person that blocked you to this brand-new account (pretending to be another person). However, I view this as a last hope and do not recommend it since it can backfire and make things worse than originally. This protests Facebook's TOS, likewise.
: > If you know their Facebook email address, you can create them an email from a routine email account and also it may go to their Facebook inbox (I think this still works).
: > There are various other methods to speak to the person (text, e-mail, smoke signals/pigeons, etc.).
Aside from those things, you can ask to unclog you. If they don't, feel far better understanding the individual who blocked you does not care anymore (if they apparently never ever cared, really feel also better).
Don't feel like you can't obtain a message to this person, because you can if you really intend to.