If Sabbe Dhamma Anatta then is there hope? I am hopeful that I will attain Anatta. After I attain Anatta I will cease to be expressible. That hope motivates me to give up the clinging to forms, feeling , perception , consciousness etc... But what about the clinging to the hope of getting Nirvana...? Should I give up hope of getting Nirvana in order to achieve Anatta or Nirvana ?
Nobody attains Anatta. Everything is Anatta to begin with. It's just an aspect of all realities. I think you have Anatta confused with Nibbana.