From your description it would seem the clutch friction material is worn out and needs replacing, though it is possible the clutch spring (diaphragm) has become weak.

There might be an adjustment but I have no knowledge of that model. Mechanically (cable) operated clutches mostly have an adjustment to maintain a small amount of clearance (free play) in the pedal operation and also a very few of the older hydraulically operated systems but mostly these are self-adjusting.

A healthy clutch is designed to transmit the full engine torque with a good margin extra, though it must be remembered even a healthy clutch when it is overheated can begin to slip. As a clutch wears and becomes less efficient it is important to be considerate to it and keep it cool by driving in a manner that is less stressful for it and by not allowing it to slip.

If the clutch is not self-adjusting, adjustment should be attended to during routine maintenance or when needed. Even if your car has an adjustment I think it is unlikely to help...