He also has critics in his own party
Talking out your *** here. Don't get over your own skis.
Zelensky IS the party. It didn't exist three years ago. The party is named after his television show. Significant portions of the upper echelon of the administration are made of people who worked for his production company. His domestic political competition is all outside his party - and largely focused on his relationship with Igor Kolomoisky (which is one reason why he can't take more water on regarding corruption or quid pro quo deals). There's no catering to his party base concern like there would be in America.