Think about the notes inside the shapes
Instead of treating each chord as one block, compare the notes in the current chord with the notes in the next chord. Some may stay the same while others move by a small interval.
Keep common tones when useful
If two chords share a note, keeping that note in the same voice can make the transition sound connected. The other voices can move to the nearest required chord tones.
Inversions create options
A progression can have several valid fretboard routes because each chord has several inversions. Voice leading is a way to evaluate those options by note movement rather than habit alone.
Use a limited fret range
Restrict yourself to a small area and find a nearby voicing for every chord in a progression. Then compare a second route that uses different top notes. Both can be correct while producing different melodic results.
Voice-Leading Trainer
Fretwise presents candidate shapes and compares movement/common tones so you can practise recognizing why one transition may be smoother than another.
Keep learning
Use these ideas as practice concepts rather than rules. The useful question is whether they make the fretboard easier to navigate and the harmony easier to hear.