Ignorant American here - I apologize if this has an obvious answer.
Boris Johnson is no longer prime minister, but he will retain his seat (AFAIK) in the House of Commons. Some polls indicate that he is still very popular with Tory voters. In the U.S., Donald Trump is no longer president but still very popular with Republican voters.
Trump can wield political power by coming out for candidates that support his views, and oppose those who voted for his impeachment. This allows him to build more political power, which may help him in future elections.
Does Johnson have any similar ability? Can he support "pro-Johnson" candidates and oppose those who voted him out, angling for another term as prime minister? Does his continued presence in the House of Commons grant him a stage to do so?