Value averaging (VA) aims to invest more when the crypto price falls and less when the crypto price rises. Under the VA strategy, an investor determines the target growth rate of his bag.
For example if an investor wants to grow their bag to 12 ETH by the end of the year, they would need to purchases 1 ETH worth of tokens every month. Note that the price paid in fiat currency (e.g. USD) would fluctuate based on the price of 1 ETH at the time. So some months the investor pays more and some months they pay less.