I expect him to surely break in to the top 50, fair chance to break into the top 20... above that, possible, but hard to tell. Given that no Brazilian other than Kuerten has ever broke in the top 20, top 20 would be a feat.
On clay he could really do well, but he can be more than a clay courter. As we always say here, you need a weapon, and he has one in his forehand. It is very heavy. When he beat Tsonga in 2016, he went toe to toe with him, and that surely surprised the Frenchman.
He is slowly improving, so I do not expect him to jump in the rankings that soon. But he could surprise and string some results coming the European clay season. If he and his team has patience, things look good.
I am surprised that he can communicate in English language, I was sure he couldn´t.
He has a tough draw at Miami in Troicky. Given that the court is extremely slow, he may have a shot, but I would guess he has no more than 5 matches total in hard courts, in both Challenger and ATP tours together. He lost a close match to Klizan in IW, having set points in the first set.
As he says in the video, he needs to work on his return and on his volley, which is very poor. He also needs a better second serve.