Could I have increased my potential reward?

Yes, users who used the locking tool found at locker.aqua.network, were able to increase their reward. Using this tool users locked AQUA for up to 3 years against their wallet. The more AQUA, and the longer those AQUA were locked for, the more boost a user received on their airdrop reward. Users could gain a maximum of 4 times their base reward.

Example:

The simplest explanation for the effect of locking AQUA is, the more LockedValue in AQUA you had vs the UnlockedValue of XLM, yXLM, and AQUA in your wallet, the higher your boost would be.

1 AQUA locked (Equivalent of 0.039 XLM) vs 1000 XLM unlocked->

LockedValue = 0.039 XLM (0.0039% of wallets value)

UnlockedValue = 1000 XLM (99.9961% of wallets value)

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1000 AQUA locked (Equivalent of 39 XLM) vs 1000 XLM unlocked ->

LockedValue = 39 XLM (3.7536% of wallets value)

UnlockedValue = 1000 XLM (96.2464% of wallets value)

In this example, the user with 1000 AQUA locked got a lot more boost than the user with 1 AQUA locked.

To achieve the max 300% your LockedValue vs UnlockedValue needed to be close to 50% Unlocked & 50% Locked