I mean, the sense of not quite belonging / being new to the party is just part of the expat experience, I think, and you said you don’t want to go back to India. So I’d say your best bet is a country that has a long tradition of immigration, a country with loads of very strong expat communities. In Europe I guess your best bet is France? But honestly I think in your case, it’s probably better to set your sights on the US. You’re not gonna find a significantly different attitude to expats and significantly larger expat community in Scandinavia or southern Europe.
In order of preference:
Singapore is economically extremely competitive, highly developed, safe, English is pretty well understood, but it’s entirely urbanized and there’s no “lonely beaches” where you can live an isolated beachbum / island lifestyle.
Thailand is still pretty decent in terms of safety for Southeast Asia, but has some political instability that comes up semi-regularly, English will work… soooometimes, and I’m sure there’s decent private healthcare if you can pay for it, but it isn’t economically competitive with Singapore… unless maybe you’re in downtown Bangkok, but there’s no beaches in downtown Bangkok.
If your husband’s family are scattered around Asia, chances are he speaks an Asian language? If that’s the case go somewhere where at least one of you can speak the language fluently. There’s no point in moving to a beach with no job, no services, no social life, and where you can’t talk to anybody.
And think of it this way, whether you’re in Singapore or Bangkok - you’re in Southeast Asia, a bunch of lovely beaches are within like a one hour flight or an overnight bus ride. Maybe you won’t live on the beach, but services and infrastructure just tend to be better in the urban centres.