Hi CC experts. I am interested in maximising cashback and would appreciate your feedback.

Currently using HLB Wise VISA for general, Maybank2kard AMEX Platinum for weekend and SCB Just One MCARD for petrol. Spending between 5K to 10K a month and maxing out the cashback ($100 + $50 + $50) each month.

Got any other suggestions what is the next best card with the highest cashback that I should apply for? No annual fee please - unless the cashback is super good.