If I was advising Trump I would offer him this simple advise and I think we would see his ratings go up exponentially
1. Either close your twitter account or hand it over to a professional spokesperson with the direction, only positive tweets come from this account
2. Immediately stop referring to colleagues, subordinates, congress and well, anyone with derogatory nicknames like Little ____ and Lying ___ and Short____ it's demeaning to your office and you, not them.
3. You cannot say "Some people say". Either a specific person says it or you say it. You can no longer make stupid claims and play it off like "someone said I was the greatest" or "Some people say it's treason" if you don't think it, don't say it.
4. If you know it isn't true, or can easily be fact checked, stop saying it. Yes, it hasn't stopped you so far but this is America, not a court room. John Wayne, apple pie etc.. The Truth should be valued.
5. Stop antagonizing the 50% of the country that doesn't happen to be democrat. Basically act your age pre- dementia
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There are more, but with these simple adjustments any CEO should not even have to make...but could easily incorporate, I think the divisiveness would diminish and people could get behind him easier.