Where did I send it (pt. 2)

My first post was this- "I was looking through my Coinbase transactions from a while back because I thought I remembered storing away some Ethereum somewhere about 4 years ago. I was is a car accident around that time and had a pretty bad concussion, I have no recollection as to where this wallet(?) is. I have the public address where it was sent, and I have a seed, but don't know what to do to retrieve it… Does anyone have any suggestions on how I can track it down? much obliged…" It took me a little while to figure it out, but the Seed I thought was related to this missing Ethereum is actually for something else (this Genesis thing on Github). When I click on the transaction details on Coinbase, it goes to Etherscan. The only transaction is the initial transfer and a Livepeer token I somehow got LOL… but it's never been transferred out. I know the address where it went, and I have a .keystore file that I'm pretty sure goes with this mystery. But how can I find the wallet? I searched my browser history for clues, and see my activity on Coinbase the day of transfer, but no other crypto-ish sites visited then, or the 6 months prior… no other clues. Any ideas on how to find this elusive chunk of change?