You can use earned Wizz Air points for Wizz Air services: buying cheaper Wizz Air tickets, paying for luggage or buying extra services offered by Wizz Air (excluding car rental). There is no possibility to redeem points for other airlines or for cash, for example.
If you want to have more flexible rewards, consider applying for a travel rewards credit card. For example, the Discover it® Miles credit card may be a good choice. It allows to earn unlimited 1.5x miles per dollar on all purchases. The miles you earn your first year will be matched at the end of the year (if you are a new cardmember). Earned miles can be redeemed as travel statement credits or as cash deposited to your account. When redeeming for travel statement credits, you can cover the cost of any airline ticket with miles. Also miles can be redeemed for other travel expenses like hotel stays, cruises, car rentals and more. The card has no annual fee and no foreign transaction fee