Should I buy something like this
https://www.ebay.com.au/itm/New-Shimano-SLX-M7000-1x11-Drivetrain-MTB-Groupset-6-pcs-32T-34T-11-40T-42T-46T/122470872669For my old 2014 Trek X-Caliber
Or should I just sell the bike and put the money towards a new/better bike?