Unlike the two-party democracy of US, India has a multitude of political parties holding power at the state level. Many of these parties (AAP, TMC, DMK, etc) whip BJP's arse in state elections. There are talks of a third party AAP gaining enough support to contest at a National level in the future.

There has been no evidence of BJP rigging National or state elections until now. In fact parties like TMC which progressive media often hail for opposing BJP have been found to indulge in electoral violence and rigging [1]. These parties run unhindered in what english media essentially calls the Nazi regime of Modi.

Where is the evidence for BJP winning due to suppressing political parties? A political party or politician who you don't like being elected (in free and fair elections) does not qualify.

[1] https://indianexpress.com/article/cities/kolkata/tmc-accused...

EDIT: sidenote: Electoral violence seems to mainly be an issue in West Bengal. Other states have a lot of issues but the scale of gratuitous bloodshed that follows elections is a unique characteristic of the state. That no Indian government past or current has tackled this issue, only speaks for the inability of the Indian state to effectively project hard power.