Trump has a mandate to rubble the likes of FBI..
And a few other alphabet agencies.. maybe even things like the CDC,NIH...
The entire swamp actually..
That mandate didn’t exist in 2016.
It does now..
That’s one consequence of the stolen election of 2020.
The swamp is due to burn one way or another..
Trump has the mandate to light it up now.
With extreme prejudice.
No other R team member does.
None.
As soon as the next Democrat becomes POTUS all Trump’s policies you described will be reversed on Day One.
Without legislation to gut some of those agencies then any changes are temporary and what are the odd of any Democratic or Republican Legislature will do that.
You need multiple things to happen to have any meaningful change in Washington, multiple Trump MAGA candidates in a row that actually win elections, combined with a cooperating legislature, without that combination of things any Trump changes will be temporary rather than long term.
The most long-term change Trump got thru was the Federal Court judges, as I mentioned in another response, he got those judges passed by having a Republican Senate that voted for them, otherwise there is no way Barrett, Gorsuch, and Kavanaugh would get confirmed, not to mention all the other lower court judges.
Trump’s successes in Energy, Immigration, Regulations, and Foreign Policy were all wiped out in less than one year.