I believe that Inter is doing much better financial compared to last year. Last year they were so bad that even though they won the league, they had to sell some players. This year they are not there, they are just not buying players, there is a big difference between "selling our good players" versus "not spending transferring fee when getting new players".
They went farther in Champions League this season so he has more income from it. At least Inter Milan did not collapse after the crisis in last summer and they even managed to play very strong in this season. Better result in Champions League and only competed for Serie A till the final day. They must buy a younger striker because even Dzeko is a successful transfer but he is too old. Perisic and Sanchez are old too.
In order to maintain their strength, they must buy some good young players as preparation for these old players in one or two seasons.
As long as they can keep their good players, and add in some new players from the market without spending much, that would be a lot better next season. This will of course take some time but I believe that Inter will get back to financially positive situation, and when they do that, championship will become easier.
A healthy club in finance can not totally rely on budget from their owner. They must have good financial balance between income and outcome from their results in national league, European league, cups, friendly tournaments, etc. and from transfer market too.
In a new season, it is harder for Inter Milan in Serie A because AC Milan now is the champions, Juventus and AS Roma will be more competitive with their second season under Max and Mou.