Screen new recruits for innate curiosity.
Make curiosity a sales team value.
Start new reps out on the right foot.
Invest time into ongoing skill development.
Continuously coach for curiosity.
Other resources for curiosity.
Questions that Sell by Paul Cherry is my go-to book for this, but if you search, there are many other books that dive deep on this topic too.
Check out Selling Through Curiosity for an interesting way to build this skill in your team.