So, if you've been following the guide up to this point, you should be a master boss. Congratulations! At this point, it is time to find some direction with your character. It depends what you want to do:
If you want to be able to fight and beat any player:
If your goal is to beat other players, once you master underboss and start to work on boss, you should start switching over points into attack or defense. If you want to be able to beat any player you wish, but don't care about losing fights to people who attack you, you can dump all your points into attack. Additionally, use your massive energy pool to collect AR-15s, Humvees, and Federal Agents to have an advantage over "balanced" opponents. Use your energy pack to stock up on blackmail photos for more federal agents. These are the best 3 attacking items you can have. If you want to be able to survive attacks too, you should split your points between attack and defense, and work on collecting the defense items like the Private Jet and Falsified Documents. Bonus Weapons (which you can buy) are pretty much the best defense weapon, so buy up to 501, one for each person in your mafia.
If you want to fight often:
If your goal is to be able to take out people on the hitlist, you will want to follow the above strategy but put a few extra points into stamina. Health is kind of a waste of stat points, because you can heal at the doctor every few minutes. If you are taking too much damage during fights, get better weapons and fill out your mafia!
If you want to be have the highest level character
If you want to be the highest level mobster around, just keep doing efficient jobs and load all your stat points into energy. Energy packs can be used to collect good defensive items, like falsified documents.
If you want to collect a lot of property and money
Simply having a very large energy pool and doing jobs is the best way to get money. After 200 or so casinoes/offices/hotels, these investments take MONTHS to pay themselves off. At that point, you will rely on jobs to bring in the most money. You might think that you will want to put points into defense to protect your property from robbers, but simply having a full mafia and keeping the property protected will ward off most attackers. Additionally, getting robbed once in awhile is not a big deal. You will make a lot of extra money with your large energy pool and will be able to repair and protect buildings without putting a dent in your bank account.
If you simply wanted to master all the jobs
You're done! You can go back to doing something more productive now.
Feel free to post any questions or comments!