Then you have to pray hard so that your wakil rakyat or ahli parlimen die.
If there was no by-election, your hometown would be left behind from any development. Unless of course it has a gold mine or timber forest ready for exploitation.
It is very cheap to retain your control in Malaysian politics.
Build new road (only if someone died)
Get the ministers to visit.
Use all available media.
Oh! Machap is in Melaka and Ijok is in Selangor.
I haven't got a clue until their Wakil Rakyats kicked the bucket!