Given your very low daily and monthly driving usage, an electric car sounds like it would make the most sense, but on your 2-3 long drives, the range restriction might prove an inconvenience. Moreover, given your limited usage, the extra purchase cost of the EV may not be justified, and all the EVs you have shortlisted are either at the very edge of your budget or above it. Thus, a frugal, low-maintenance petrol car or a hybrid might make more sense for you.
Amongst the cars you have mentioned, the Tata Sierra petrol seems like a good bet - it's more spacious than the Curvv, and comfier than the Kia Carens Clavis. However, you should consider a hybrid, like the Maruti Suzuki Victoris, of which you can get the mid-range ZXi variant in your budget of Rs 20 lakh.

