For the record, Donald Trump's Real Clear Politics Average Approval Rating is only at 43%. You are only citing the result of one poll, which can always be an outlier. Trump's average among all the polls on Real Clear Politics, is still right in the middle of where it has always been - which is in between 37% and 46%. In fact, Donald Trump's Real Clear Politics Average has still never been above the 46% number that he was elected with in November of 2016.
Also, the poll which Trump has tweeted most frequently is the Republican Party-friendly Rasmussen Reports poll. They actually had his approval rating at 53% before the "whistleblower complaint" story broke two weeks ago. Trump even tweeted that poll (twice!). However, Trump's approval rating in Rasmussen Reports now sits at just 48%, which would indicate a 5 point drop.
This also shows that the conservatives on the Volnation politics forum are being disingenuous when they disparage and discount poll results (which is usually done by pointing to the 2016 Presidential Election). Conservatives do follow polls and they do trust them. Conservatives only try to discredit them when they don't like their results. Trump is the same way.