Even if Trump had immediately accepted the election results, it would still have been difficult for an ex-POTUS, who lost an election, to retain political power. As it stands now, he will have no platform to preach to his base. He is a danger to the country and will be blocked at every turn by the government. As I posted before, it will be nearly impossible for him to get permits for his rallys. Most corporations won't want to support Trump, so if Newsmax or OANN let Trump rant on their shows they will lose sponsors. The My Pillow guy can't foot the entire bill.
Trump 100% believes that it is impossible for him to lose a fair election and combined with a fear of being prosecuted in N.Y., it triggered incredibly deranged behavior to the point of madness. The L.A. times posted another from afar diagnosis and this one seems accurate:
https://www.google.com/amp/s/www.latimes.com/opinion/story/2021-01-09/donald-trump-mental-state-25-amendment%3f_amp=trueHis belief that he unfairly lost the election has pushed out all other thoughts in his mind and it's said that in the WH, all Trump wants to do is rant about the election and people are staying away from. According to the article, most people don't recover from the condition and it's likely he will be obsessed about the election for the remainder of his life. He couldn't possibly put together an effective message for his base in his current condition.
It's possible that Pence, even after being called a pu**y, believes Trump is mentally ill and is showing some compassion for him by not pursuing Article 25,