TBH I don’t know much about other auxlangs/conlangs besides Esperanto. What makes you prefer Interlingua?

If you mean “is Esperanto English”, the answer is no, they’re pretty different, Esperanto combines elements of latin and slavic languages. If you mean “Isn’t English already an auxiliary language”, the answer is also no. English is a lingua franca, not an auxiliary language.

Reading through this thread really makes me wish Esperanto or some other auxiliary language caught on

Perhaps you just haven’t found anyone worth interacting with?