https://www.presidency.ucsb.edu/statistics/elections/2024
It's also not that large historically speaking:
https://thehill.com/opinion/campaign/5094602-a-landslide-jus...
Also, his popularity has been dropping, even among voters who voted for him:
https://www.reuters.com/world/us/trumps-approval-rating-slip...
Finally, a lot of voters seem to be disapproving of what he's doing even if they don't disapprove of him. DOGE is becoming unpopular for example, even among people who support Trump.
I agree with your skepticism about a constitutional convention, but I also think something of that scale is necessary. I don't see how the US can continue on this path with blatant disregard for the constitution.
From my perspective, the problem currently isn't with the US constitution per se. The problem is people ignoring it. Maybe that's part of the same problem, but it seems to me any legal system breaks down when everyone is ignoring the law.