I’ve been doing some SEIR modeling for India.
I used N (population size) = 200,000 which is obviously too small.
Datasets which might be useful to you:
Case Count History: Please find the case count data for India along with some other countries here: https://api.steinhq.com/v1/storages/5e6e3e9fb88d3d04ae08158c/CaseCountData
Case Histories across the country with age, gender and location: https://api.steinhq.com/v1/storages/5e6fd170b88d3d04ae081593/Raw_Data