Missions, Tasks, Quests, Challenges - There are many names for these kinds of campaigns which keep your players engaged and working towards completing that next thing to get the reward. Create them Daily, Weeky, Monthly or as things to do on Special occasions. Pay out prizes smaller prices, but make sure to always have that glistening diamond.
This Campaign type keeps your players trying to beat their own score! Complete the tasks in as few spins as possible, and keep chasing for the top prize. Create a set of Tasks, decide how many spins your players need to complete them in and reward the ones who do!
Reaching the competitive spirit in players is a great way to keep them engaged and enjoying the time spent with your brand even more. Build your tournament the way your players want it and have them battle it out against each other for the chance to win big prizes.