1) I use a trust wallet to store crypto. My question is how safe it is to store over $20k coins? Yes, of course, I take care of keeping my mobile safe and virus/malware free so never click on any unknown link as know about his as i am in IT field.
Trust wallet is closed source and a hot wallet. It is one of the least safe choices to store large amounts of coin. I would definitely invest in a hardware wallet if I were you.
I'm not sure about availability in India, but it probably makes sense to first check which hardware wallets support the altcoins you want to store and then go from there.
The Trezor web shop does not seem to include India as a shipping option. The Ledger web shop does. However, both Ledger and Trezor both list
www.etherbit.in as their official Indian reseller, as you can see on the following pages:
https://www.ledger.com/resellerhttps://trezor.io/resellersLooks like etherbit is a bit more expensive than either of their own web shops, but I don't know how much extra in shipping or how long you would have to wait for delivery by ordering direct.