The answer suggests itself. And where else should he write, not to the American media and media resources, which regularly throw mud at him, accusing him of being connected with the Russians and rigging during the elections. Trump has created his own media in the form of a Twitter channel, he is his own journalist and broadcasts his position to the world on the Internet regarding world events.
Trump became president thanks to the reality show effect that social media creates. And thanks to Twitter, he has the opportunity to communicate directly with his voters, with a huge number of subscribers (more than sixty million), the ability to address people directly.
The peculiarity of Twitter, unlike Facebook and other social networks, is that there is no so-called smart feed. On Facebook, a person publishes a post and does not know whether they will see it or not, because Facebook decides what to show and to whom. Twitter is more straightforward in this sense. Of course, there are people who are subscribed to the user, but can skip the post, as they scroll the feed at the wrong time, and it is overloaded with new messages. But the text you wrote will appear on Twitter for sure. Therefore, this social network turns out to be an incredibly convenient tool for politicians.
Trump won the election largely thanks to Twitter. In the era of social media, people are interested in bright things, they are interested in directly participating in the process. And Trump addresses the common American in his publications.
In addition, Twitter helps maintain Trump's celebrity boss image, which has been pretty common in America since the days of General Motors investor Lee Iaccocka. Trump is the star president. Twitter is helping him stay in touch with a loyal audience and, quite possibly, his skillful handling of social media will give him a second term, despite all that is written about him in the press, which is read by far fewer people than Trump's Twitter.
I don't know if Trump is going to appeal the US court's ban on Twitter. In America, the law is very serious. You need to closely monitor the process: is it the final instance or not. In any case, the mention of Trump plays into his hands. He is a star.
As for the ban on blocking opponents, this is a really funny American feature associated with freedom of speech, and specifically with political communication. If Trump is the chosen person, then he cannot refuse to listen to what people tell him.
It is unlikely that the decision will somehow affect Trump's Twitter, this is just another informational occasion. People read the president, not the messages that others leave in his feed. Moreover, if a person hates someone
, he becomes stupid. Therefore, Trump's opponents often make themselves appear even more stupid than the American president himself.