Possibly a bit more, but not much more. Certainly not the kind of attention they did prior.
Being President was the reason for his popularity, not being on Twitter. He was tweeting from a personal account that he had prior to running, which no one cared about until he got into office and decided to make it his primary means of communication with the public. His content on Twitter was no better than on his blog, but when your shitposting can start a riot or maybe a war, people have to care.
Yes, I do believe that, contrary to the narrative, Donald Trump no longer being President has more of an effect on his messaging power than his site not being hosted on one of the social media silos.