Why can't representatives do it?

Housing and rent price reduction is one of the key issues politicians campaign in NJ; For 8th congressional district, both Menendez and Ali are campaigning for lower rent and affordable housing. Menendez has been focusing on this topic for his campaign since 2022 and 2024, yet there isn't anything done about it. He's campaign for upcoming elections is same too. And Mussab Ali is same too.

But why wasn't Menendez able to deliver affordable housing or lower the rent for families in these 4 years? What makes him do it this time? Same for Ali? How will he do it ?

Can they actually do it or is there some core issue that needs to be solved? Can it be actually done or is this just to gain votes?