Timing Mechanics: Quick time events, but only if they’re done well

You could also increase the reward for the correct response and increase the penalty for an incorrect response. For a fighting game, this means executing the correct combo at the right time does extra damage, and using the wrong combo or missing the time window leaves you open to getting wrecked.

Resource Consumption Mechanics: Usually this is where layering resources occurs, gear and a skill tree or a skill tree and temporary buffs, etc. Metacurrency can be considered either mechanical or numbers based depending on how it’s handled.

I also think forcing players to change the types of resources they use instead of sticking with the kind they prefer fits here. For example, if you only use the shotgun in an FPS, you may be fine on lower difficulties, but you need to switch to more effective weapons on harder difficulties (in Half Life, crowbar for headcrabs, assault rifle for people, and shotgun for head crab crowds or close combat, etc). If you use the right tool for the job, you'll have enough resources.