;)
Why don't you use the coins you've gained in your first trade and buy more wool?
You could gather a couple of bags together, hire space on a boat and travel overseas to trade.
Consider carefully before deciding where you would like to sail. Wherever you go there must be merchants willing to buy your wool. They, in turn, must have luxuries to offer you which you can sell for high prices when you return to Berwick.
;)