Start with notes you can name
A triad contains three different chord tones: a root, a third, and a fifth. Choose one major chord and locate those notes on a small group of adjacent strings. You may already know them inside a larger open or barre shape. Play only the three selected strings and say the note names slowly. This connects the shape to its harmonic meaning rather than adding another anonymous fingering to your memory. Keep the remaining strings silent so that you can hear the small voicing clearly.
Find a nearby version of the next chord
Choose the next chord in a familiar progression and look for its three notes near the first shape. Keep a common tone when possible and move the others by a short distance. The lowest note in your voicing does not have to be the root unless the arrangement requires that bass. Practice the two shapes as sustained sounds before adding a rhythmic pattern. Listen for the top note, which often becomes an audible melodic line even when you are thinking only about chord changes.
Give the new position an arranging role
Try the compact voicings while another guitar plays open chords or while a bass instrument supplies the roots. The different register can create separation without requiring a more complicated progression. For solo guitar, alternate a low bass note with the upper triad if that suits the song. Use diagrams as a starting reference, then verify every note with your ears and fretboard knowledge. Do not move higher simply to make the part seem advanced. Choose the register that leaves room for the vocal and gives each chord change a clear, connected sound.