Ford’s pardon came after Richard Nixxon accepted the fact that he did something wrong and resigned as a consequence. While he believed he did nothing wrong (“I am not a crook”), the fact that he did resign (even if avoiding impeachment potentially was a big reason to do so) shows at least some level of remorse or realization of overstepping boundaries. Nixxon gave up his office as a result of his actions.
Trump does not show any signs of moderating himself. To this day, he claims the election was stolen. To this day, he repeatedly portraits himself as a victim of a witch hunt - particularly to the core base of his followers - inciting fear and hate in a large group of unhinged people. There is no remorse, there is no accepting the consequences of his actions, there is only an urge to rile up people, avoid consequences and enrich himself.
Giving Trump any more leniency would just encourage him to keep doing what he does.