There is no other country that has adopted BTC as a legal tender and i don't think we will see any country going down that route in the near future, what most countries are doing now and looking to do is to make a BTC strategic reserve.

BTC experiment failed in El Salvador because their people didn't really understand BTC and also with the way the government introduced BTC with a centralized Chivo Wallet. El Salvador is a very poor country with a bad economy, so they need the loans from the IMF, BTC can obviously not solve their problems.