dominiquedipiazza 3 finger technique

Hi: I’m getting old and I want to switch my 2 Finger technique into a Thumb Index Middle 3 fingers technique. The Master DDP uses Thumb and index almost all the time and sometines he uses 3 fingers, even 4. if I want to play a Cmaj7 Arpegio starting on A string 3rd fret, wich will be the best...