Blizzard's development notes for the Patch 11.0.7 PTR hint that professions may be getting a new specialization respec option that would allow players to refund and respend their knowledge points.
Professions in The War Within There doesn't appear to be any indication of this profession respec feature on PTR realms currently, but this has been highly requested since the profession revamp in Dragonflight.
While we're uncertain what costs or limitations there might be, pairing this with the profession stat rebalance listed below would be ideal timing.
This Public Test Realm (PTR) is a testing environment for upcoming World of Warcraft content. The War Within: 11.0.7 Content Update Development Notes PROFESSIONS Pairing with the release of the specialization respec option, we are deploying some balance changes to several profession stats to bring them closer together in value.
Multicraft – Average number of extra items created via a Multicraft crit reduced by 30%. Resourcefulness – Average percent of reagents returned on a Resourcefulness crit increased by 50%.