which genre within indie rock?
Arctic monkeys are pretty great, and since you like them, maybe you'd like the black keys. They're more blues-y, whereas arctic monkeys are more punk rock-esque, but it's worth a shot.
I'd also suggest Foals. They're an amazing band. When you try them out, listen to each album of theirs. Each one has a pretty different sound than the others. Their first album is pretty up beat, whereas their second is very mellowed out, and the third is in between but on the more mellow side.
Some other great bands are the strokes, two door cinema club, bombay bicycle club, bonobo, calexico, Starfucker, the dead weather, vampire weekend, and the fratellis. All of these bands are super different, but maybe you'll find a few different genres you enjoy
If you don't already, try using spotify's related artists tab when trying to discover new music. I've found tons that way