Once you have selected your best cash back card, you should use it to the maximum whenever you spend some money to collect reward points. If you do not use it, it is not going to benefit you anyhow. It is true that you cannot spend money just to collect the reward points but whenever there are some expenses, you should put that on reward card instead of other cards.
By using your cash back card, you can get some money back and even if it is small amount, why not go for it. You can control your budget and pay the weekly bills through your cash back card. For more information about collecting reward points, you can call maybank2u.