You obviously don't need any classes at this point because your Greek is good enough to communicate in the real world and that's the reason we don't offer an actual Greek course at this point, but I'm going to give you a list of interesting resources that have helped me a lot and continue to do so when it comes to improving the different languages I speak.
As usual, feel free to use those you enjoy the most and the ones you can perfectly understand. And finally, and even though you can perfectly communicate, remember that comprehensible input is what you need to keep getting better, output is just a consequence.
ADVANCED VIDEOS AND RESOURCES TO LEARN GREEK FOR FREE
