Here's my "write all posts in English" experience so far :
Previously when writing in Bengali, new followers would suddenly spike over 24 hours whenever someone reminded my name in the underworld [read, criticized my post in a secret group :-) ] and then fall within the next few weeks. Thus stayed more or less level over time.
So writing in English would make a sharp decline in followership, right? That's what I assumed, but didn't happen. As soon as I started writing all in English, that gradual declination stopped. Apparently no one hence after un-follows me. And I watched gradual increase in followership that almost never happened when I used to write in Bengali only. This one is surprising. Maybe there's an easy explanation that I overlooked.
The spikes still happen, as how it happened a few days ago when I posted a few Bengali posts. But I have no idea who-where remembered me for that to occur. :V