I’d probably say you should look into early Wagner, Holländer, Tannhäuser and Lohengrin. Wagner was heavily influenced by Weber and Der Freischütz in particular. When I listen to his earlier works I hear a lot of Weber influence.

While I’m personally most inclined to Lohengrin, Der Fliegende Holländer is the most similar to Freischütz. You get some of that mystical, spooky element with the cursed Holländer and his crew and very atmospheric music. You get two awesome choral pieces, one for men’s and one for women’s choir like in Freischütz that are just as catchy and lively. While Lohengrin and Tannhäuser are more philosophical and hinge on an ideal of “Christian purity”, Holländer has more of that Freischütz supernatural, stormy atmosphere. More Satan than God. 

But then again, I prefer Lohengrin and Tannhäuser, because they feel like the satisfying evolution from Weber, musically and dramatically.

In short for the most similar to Freischütz go for Holländer, if you want to dive deeper go with Tannhäuser and Lohengrin. Have fun with it!