Disengage the trip mechanism to activate the second hydraulic cylinder. This enhances the range of motion available to the loader and allows you to carry more weight in the bucket.
Detach the standard loader bucket and attach a bucket with greater volume, which will allow you to lift more weight.
Secure another attachment on the loader's rear three-point hitch. The specific type of attachment is not as important as its mass, since it will act as a counterweight to the weight lifted by the front bucket.
Replace the hydraulic cylinders with larger cylinders, which will make it possible to lift more weight but will also slow the speed of the machine.