Yang has succeeded in getting more name recognition and support than I think even he thought was remotely likely to occur and kudos to him for that.
OTOH I think he has completely failed to accomplish what I believe was his actual main goal in running. He knew and knows he has no chance of being the nominee; he was hoping to shoehorn universal basic income in as part of the debate, a bigger part of the discussion, to get other candidates with better chances of winning to take it up. And that discussion has just not caught on. Warren had at one point said it was worth considering but her wealth tax is where her discussion is at, but that is it. Biden, Sanders, and even Buttigieg have either not taken it up or explicitly come out against it, and it has not caught on as a subject of interest in general.
My WAG is that awareness of the UBI concept is pretty flat since the first debate and that net unfavorability of it is also unchanged. His likable style has won some new supporters, but the idea that he means to promote has just been a lead balloon. Rightfully so mind you.