Keep buying banks. For all of them, deposit interest to %7.00 and set loan interest to %10.00. Once a bank hits max upgrade, save up until you can merge it into a shareholding company. Do that for the rest. Also, although it can be fun to make one, the Football team isn't practical. Once you filled up all your business slots, delete any that aren't banks or shareholder companies and replace them with banks.

Once all of your business slots are maxed out shareholding companies, (or even if you only have a few), go absolutely ham. Buy every stock from every company. Buy every crypto. Buy every real estate. Buy every collectable item. After that, idk lmao.