More Hindi, please!
I've finished the Hindi tree and need to keep learning. Will there be more Hindi? If so, when?
Try the English via Hindi course. I'm doing this now, and guess what, this method is much more effective in learning Hindi than the Hindi course itself.
Outside of duolingo, you can read Hindi websites, there is a Hindi version of Quora I read everyday. You can also watch Hindi videos on YouTube, watch Hindi movies, etc.
How do you get to level 25? I have finished all of the tree to the deepest level, and that took me to level 20. Working through practice exercises (which are just re-doing the exercises) I am close to level 21, but I am quite bored with doing the same exercises over and over so couldn't stand to do it for long enough to get to level 25 if that is even possible.
Yes, I have gone from level 20 to level 21 by doing practice exercises. Now I see that to get to level 22 I need to do another 200 practice exercises (to get 2000XP). But that is not very interesting. I have now enrolled in "English from Hindi" and have already learned a few new words.
You clearly haven't reached the max level. Your tree may have been finished but you have probably have not reached lv5 in all exercises. If you have the pro version, you can easily gain a lot of xp and practice at the same time. If not, jut keep going back to lessons. Good job anyways!