u/Friendly-Buy-8467

Okay ive been playing for 2 months now and i learned 5 full songs, i felt like the chords have been getting repetitive since ive only been using my first 3 fingers and im starting to get fatigued from playing since the chords have been getting repetitive. how do i start using my pinky? I've also been eager to learn how to use my pinky since i feel like its also gonna help me play barte chords so how?