If you don't do this yourself, your brokerage will love your idle cash sitting around which they will use to invest and earn them, and not you, money. I generally hold very little cash because inflation quickly eats into its value. I'd rather put that money to better use. This brings me to the next point: putting capital to its best use.
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## Rebalancing
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Occasional portfolio rebalancing is necessary unless you are only invested in an automatic glide path fund. I generally just contribute funds to the deficient allocation category. If it requires a much higher amount than the funds available, utilizing leverage can get you to a balanced portfolio quicker.
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The paper [Rebalance your portfolio without selling](https://arxiv.org/pdf/2305.12274) describes some more complex ways to optimize rebalancing.
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## Efficient use of capital
One of the most important things I've come to realize is that you have to make efficient use of your capital. Tom Sosnoff and Tastytrade have some good videos on this: