The Ottomans have been gone for less time than the US has been free of slavery. African Americans, as a group, are still struggling. I don't see why an entire nation should be recovered.
Comparing Bulgarians 200 years ago to african slaves in Usa is quite weird. Blaming Ottomans for the todays Bulgaria's all problems is beyond ridiculous, and maybe the sign of the real problem.
Since the last Russo-Turkish War that ended (1878) with de facto independence of Bulgaria from Ottoman empire, Russia continuously tried to turn Bulgaria into its vassal state and finally succeeded in 1944. These attempts include false patriotism that hails Russia as liberator. So the slave mentality continued uninterrupted.
There's a lot of lingering resentment in that whole general area, even after all these years.
Some of it is justified. Most of the satellite countries had to pay tribute (taxes) to the empire, money that could have been used instead for self-development. Compound this issue over centuries, and maybe you can understand why people are not happy about that part of history.