Ensure the jackfruit leaf cup isn't leaking. If you follow the video, the cup turns perfect with no holes.
Keep them ready before-hand to save time in the morning.
Grinding the batter using wet grinder yields light, airy batter with good volume. So use it if you have one.
I have used idli rava instead of grinding rice. You can use rice too. In that case, soak rice, grind coarsely and mix with lentils batter.
Give the batter enough resting time for better fermentation. In warm places 8 hours of fermentation is enough.
You can keep as many cups as your steamer can hold and steam them all together.