While web programming in Prolog has been insightful, I think there are more expedient areas of application for the language.
Prolog is especially underutilized in databases.
For Clojure, there is Datomic[0] (a DB with S-expression Datalog) and DataScript[1] (in memory Datalog for browser) which has a fair amount of usage. Also, there's a bitemporal database use Datalog name Crux[2] seems to be quite promising.
[0] https://www.datomic.com/ [1] https://github.com/tonsky/datascript [2] https://opencrux.com/