To understand how to increase the output force when using a lever, it's important to consider the principles of levers, which involve input force (effort) and output force (load), as well as displacement.
The effectiveness of a lever in amplifying force is determined by the ratio of the distances from the fulcrum (the pivot point) to the points where input and output forces are applied.
The best action to increase the output force would be to:
Increase the input force and decrease the output displacement.
By increasing the input force, you are applying more effort, while decreasing the output displacement means that you're reducing how far the load has to be moved, which can increase the efficiency of the lever system in lifting the load. Thus, it makes the lever more effective in overcoming the weight of the object.
The other options would either not provide enough input force or would involve movements that do not optimize the lever's mechanical advantage.