I'm studying Interlingua, a pan-Romance-English international auxiliary language that has the distinct Advantage of being able to be understood by Romance speak

I'm studying Interlingua, a pan-Romance-English international auxiliary language that has the distinct Advantage of being able to be understood by Romance speakers at the first glance. I think it's much more "useful" since I can't speak any Romance languages at all at the start. I tried looking towards Interslavic (Medjaslovanoj) and Intergermanic (Folkspraak*), and the former is interesting - Slavs can understand that register with quite a bit of effort, but the latter, sadly, is still in development and is fragmented. For other areas, Hijazi/MSA is the standard of the Arab world, Mandarin is for Sinosphere, and... Malay for SEA, I think. A worldwide international language is quite hard, because you need to dislodge the usefulness of English in some ways. A 100% constructed language is hard to learn for adults. A pseudo-natural conlang is... Impossible for the whole Earth.