The easiest thing you could do to give yourself a bit lower gear is to change your rear cassette. You can get a 9-speed 11/34T SRAM PG950 for about $35. Your Local Bike Shop can likely sell and install the new cassette for $50.
I checked-out the Reline website. I then looked up the D660 from 3 seasons ago. You got a really nice bike for a good price. I like the 1x9 setup. There are not too many bikes with a single crank ring from three years ago. SRAM now sells a 1x11 for a small fortune. I am currently building a Chrome Moly 29er hardtail. The bike will be a 2x10 with some frightfully low gearing. The crank is 38/24T. The rear cogs are 11/36T. The low ratio means I have to do 1.5 crank rotations for one wheel rotation. I have this same setup and my Fat Bike and this is a really digger low gear.