A currency has no ideal price nor any ideal degree of “strength” or “weakness”. The more a currency is demanded by either foreign importers or investors — thus the more your country exports or is deemed to be a good investment place — the higher will be the price of the currency (assuming your country has a separate one, or a few distinct ones). This price, also called the rate of exchange, is as much a result of other economic activities as it influences them, just like any price is as much a result of supply and demand as it determines quantity demanded and supplied. But again. there is no ideal price. And note that exports are not more a goal, except for exporters, than working is the objective, except as a means to exchange the product of one’s labor for consumption (including imported) goods.