There’s no perfect solution, but I agree it’s definitely a bummer when one can confidently narrow an ID down to two or three species but the narrowest valid taxon containing them has dozens to thousands of options. You might find some of the past discussion on this relevant; there is even an active feature request dedicated to this.
https://forum.inaturalist.org/t/create-a-new-taxon-rank-for-inaturalist-the-species-group/14543
https://forum.inaturalist.org/t/use-of-the-term-species-complex-in-inaturalist-taxonomy/58938
https://forum.inaturalist.org/t/creating-species-complexes/47582