Trump won the last election because of angst over immigration and economic dissatisfaction, plain and simple. he may have a gotten a boost from some of his classic culture-war bloviating (i.e., trans issues) but those two issues are really it. The problem is, him winning on those issues had a lot more to do with unhappiness over Democratic leadership and policies than it did with any great belief in how Trump planned to fix it (or really any understanding of how Trump planned to fix it, which he was always characteristically vague about, given that he has no real sense of actual policy). Now that he's president, the reality of his actual policies is more unpopular than what we had under Dems, so it will swing back the other way. This is why Trump is a very effective "outsider" candidate but a terrible candidate as an incumbent.