You can put your tweets in a list by typing or by importing a CSV file that can be easily prepared in MS Excel/Google Sheets/LibreOffice Calc.
Just give some tweets add then set the frequency of tweets. Frequency should not be too low as official Twitter documentation clearly says "You can only post 300 Tweets or Retweets during 3 hours." which is like One Tweet after every 1.6 min and thus we recommend you to set a frequency of 100 sec or above.
There may be times when Twitter detects you that you are not human 😉. Don't worry just use the official Twitter app they may ask you for OTP and you are free.
One important thing..👉 Never Ever share your API keys with anyone. It is something more important than your Twitter password !!😲
So you may think "Can't you steal it?".
Our answer is "Yes we can, but we don't. We don't send your keys on our server or somewhere else. It is stored in your phone itself and only your App can access it". You have to rely on us, Twitter, and Android OS.