This seems, well, a little selective, being focused exclusively on 19C Italian Opera and Mozart. I think it's entirely possible not to particularly like these works, whilst enjoying operas by other composers.

My starting point in opera was Janáček. The Cunning Little Vixen and Jenufa, for example, are both stunning works, musically and dramatically, and sound entirely different from the operas mentioned in this piece. The recordings by Charles Mackerras are unbeatable.

But if you don't enjoy Janáček then try someone else's work as you never know what you might like!