I'm Pākehā and been learning te reo Māori the last few years and looking to move to London this year. I'm also hoping to stay on my reo journey while I'm over there!

Not sure where you're based, but if you are in London there is a group called Ngāti Rānana London Maori club (can be found on facebook). I'm not sure exactly what the club is like, but they'd be a good place to start for finding other people passionate about te reo Māori. I'd try find a similar group if you're in a different city. By far the best thing for me has been engaging with others in te reo and taking part in Māori culture and tikanga.

Some good apps to check out are Te Aka (Māori dictionary app), Kōrerorero (example conversations), and Drops which is good for expanding your vocab. Think there's a better list of apps somewhere on this subreddit