The offer on roobet.com is very limited.
Why not choose professional software and offer hundreds of games?
Seriously, Are you saying this for real? They are offering more than 1000 slots and tons of live game using various 3rd party provider. Go to this
https://roobet.com/slots to check their over 1000 slots
Keep playing in a way that is understood by numbers 1.2-1.5 is a market where we can cash out faster even though it's small as long as the winnings are above 70%.
Keeping it in 1.2 - 1.5x ranges wont really do much if you intend to do tons of bet. In the end you are losing more than what you are expecting to get back from doing such bet.
Instead of doing it on crash which would take a long time, there is no different if you just set autobet on dice with ranges of 1.2-1.5x multiplier