Lots of people have underestimated the depth of his intellect and then bore the brunt of his coherent strategies to get even with his 'enemies'.  It may turn out that he colluded with Russian intelligence specifically to get the presidency and that would indicate a coherent strategy.  What his personal agenda would be for the presidency is an altogether different question.  It's not to 'make america great again'.  That would be a secondary effect if it happened at all.