My team is level 15, stadium is level 14 (183k capacity) and I have 2M fans.
My tickets prices are $40 for the League games, $42 for the CL games and $44 for the Cup. I've tried different combinations of prices and this was the best for me. Every game is almost sold out (I get 4% possession bonus instead of 5% as if I had a sold-outs every game, but I don't care about that 1% and prefer a higher income).

You have a relatively small arena and a huge amount of fans, you obviously sell out every game, but lose a lot of money with $14 tickets prices. You have to find out the best prices yourself, but I'd start with around $60 per ticket. Raise the prices if you get sell-outs or lower the prices if arena is not full - this way you can find out the best tickets prices for every tournament. Also try to play some friendly games - you also get some income selling tickets for them too, but for friendlies tickets prices should be really low.