Do you need to read and write as well or only speak? It took me a long time to realize i wasn’t learning anything with duolingo. I switched to pimsleur, and i have made much better progress with my Hindi.
Pimsleur advertises it can give you a solid foundation of a language in 30 days. I am too lazy to complete it in 30 days, but i can see where it is going
It is a website and an app. You can use whatever you like. Pimsleur offers reading lessons as well after you reach lesson 10.
Devanagari is a phonetic script, so you also might be able to get by on reading by learning all the characters and their sounds while learning to listen and speak