This game gets disappointingly grindy at company level 8, and doesn't seem to improve at level 9. It seems that you have to leave an autoclicker on overnight to have a chance to get to the next level. The new stock market does help a bit, but you have to save up a lot of money to make it worth your time. I think I'm gonna just quit the game for the time being, until either someone comes up with a good strategy or the game gets more features added to it.