An easy way to make Monk more attractive is to change the effect of Golden Bell shield:
Current effect: when accumulating 20 stacks, grant a buff for 5 seconds. When casting Golden Bell Shield within these 5 seconds, grant a buff for 30 seconds that increases all physical damage by 25+5xskill level%.
New effect: when accumulating 20 stacks, grant a buff for 5 seconds. When casting Golden Bell Shield within these 5 seconds, grant a buff for 30 seconds that increases the final damage by 20xskill level% when dealing a critical hit with a physical attack