Quote from efficiency:
Leverage is a tool.
Like a hammer, you can drive nails or..............smash your finger.
If you're over-trading, taking on sub-optimal positions, then leverage is probably not the best of ideas.
Constraining yourself to cash will force you to be more selective and paitient.
great traders can smash their fingers and drive the nail in at the same time, sometimes right through their hand if necessary, to make a trade work out, as a sacrifice to minimise a serious loss.
minimising a loss, or taking a brutal loss to move into something else that is profitable, is all part of the game. the key is balancing your reactions to both positive (profit) and negative (loss) as the sum of the whole.