How much slots should I activate in FORSAGE?
You can activate as many slots as you want, there are no restrictions or time limits imposed by FORSAGE. Activating more slots than your upline will allow you to supersede him and climb higher up the chain. This might increase your chances to receive more spillovers depending upon under which higher-upline your ID is placed and how active he is.
But, you should remember that FORSAGE is a platform where you can't just expect huge returns on daily, weekly, monthly, or annual basis. Even though you can supersede your upline, relying solely on that will always restrict your earnings with respect to the higher-upline where your ID is placed.
Take responsibility in your own hands and work towards your goals.