Consider signing up for another exchange and trading cryptocurrency for cryptocurrency (and then transferring that back into Bitcoin, Bitcoin Cash, Ethereum, and Litecoin, and then back into Coinbase, and then back into USD). Don’t forget to record your transactions for the tax man and to brush up on the tax implications (I can’t stress that enough).
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In 1998, Wei Dai published a description of "b-money", characterized as an anonymous, distributed electronic cash system. Shortly thereafter, Nick Szabo described bit gold. Like bitcoin and other cryptocurrencies that would follow it, bit gold (not to be confused with the later gold-based exchange, BitGold) was described as an electronic currency system which required users to complete a proof of work function with solutions being cryptographically put together and published. A currency system based on a reusable proof of work was later created by Hal Finney who followed the work of Dai and Szabo.