I want to upgrade my Hyryder to a big car which can accommodate 7 people with lots of boot space, maintenance is low, fuel economy, reliable and can go for a long time.

For a car bigger than the Toyota Hyryder, you could consider the Toyota Innova Hycross or its sister model, the Maruti Suzuki Invito. There's plenty of space inside, and the third row is quite usable for adults, too. Boot space with all rows occupied will be more than your Hyryder but not as much as the boot of a typical mid-sized SUV. If you require more luggage space, you could look to up your budget for a Kia Carnival.