Trump knows in his heart of hearts he missed his golden opportunity to strike while the iron was hot and create a new party, an America First Party.
Ah, that golden moment when the Uniparty would've had some real competition and possibly met their demise.
Timing is everything and that time was right after Pence stabbed him in the back. That time has come and gone.
Trump knows this. Even if he never admits it, he knows what could've been had he not been wallowing in his fears.