i still don’t really understand what you’re looking for.
it sounds like you might be looking for a different basemap. so if iNat’s Google basemaps are problematic, then you could try OSM, and if OSM doesn’t work, then Esri, and so on… i would assume all the major map providers have similar boundaries. if so, then you might have to have to find a map from the Indian government or some other source that has your preferred boundaries.
so if the transparency is an issue, then you can make your own map and adjust the transparency:
if the size of the squares is the issue, then you can get finer points in various ways. the easiest is probably to use GBIF’s maps, though they will have only RG iNaturalist observations that are licensed for non-commercial or public domain:
these other threads may help you make your own maps: