Without knowing your budget and body style preference, it’s hard to recommend the right car for you.
Since you are generally happy with the Amaze but find its fuel economy an issue, the closest alternative would be the Maruti Suzuki Dzire. Its AGS (AMT) automatic gearbox may not be as smooth as the Amaze’s CVT, but where the Dzire really scores is in fuel efficiency.
If you would like to see a detailed comparison between the two models, check this link:
Honda Amaze vs Maruti Dzire Comparison



