* You can lower your wage costs, either by firing players or selling them (if you succeed you get a transfer sum as well).
* You can raise your ticket prices
* You can expand your arena and hope that the gates will compensate for the cost of the expansion
* You can sell players, either from your original roster or simply players you buy and later sell to higher price.
* You can advance in cup and get money for each round you pass
* You can win league matches and make your fans more happy and therefore increase the gates.
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I can't think of any other way right now but there probably are other alternatives as well.
Day Trading / Step trading (max reccomended trades is 14-18 per season)
Play the guess the inflation game... when will it kick in? if so spend all on anyone and they will surely rise in value (be aware to calculate inflation) or if you believe we are in for more deflation sell and survive on a minimum roster and buy back when you think prices have bottomed out!