IANAL, but Ineffective Assistance of Counsel is well known to be extremely difficult to pull off, and even more so in civil cases. And, as I understand it, Trump’s sole basis for asserting it would be that the paperwork to receive a jury trial wasn’t filed properly, which resulted in a bench trial. Given that the judge otherwise provided acceptable due process to Mr. Trump, and the case appears to have been decided on clearly established facts and relevant law, I find it hard to believe that an appeal would work here.
Flipping to a different angle: Lawyers constantly fuck up paperwork; if the system allowed paperwork goofs to trigger new trials, it would bog courts down and provide an attack vector for attorneys to take advantage of.
Regardless, he'll drag it out till well after he has died of old age. The american legal system literally cannot touch anyone with money or power... see Matt Gatez for many many examples.
The sad thing is that if he hadn't drawn the spotlight on the org by getting elected and refusing to divest himself, he would likely still be getting away with it.