Whatever Finnish I had mastered while living in Finland just flew out the window when we moved abroad the last three years

Now that we're back in Finland and planning to stay, I think I should enrol in a Finnish course. Am looking for something within the Vuosaari area, preferably once or twice a week about 2 hours each time. Am also considering applying for Finnish citizenship and am told I need to pass Level 3 Suomi.
Thanks for any recommendations and advice!