How to generate or add balance in my btc testnet address


I am trying to add btc testnet, I have read that these following sites offers testnet btc but upon checking their servers were down

https://bcoin.io/
https://bitpay.com/insight/#/ALL/mainnet/home
https://api.bitcore.io/api/BTC/testnet/

Is there any other platform or way I can add balance in my testnet address so I can try transferring and viewing transactions in test mode?