It's hard to find great wingers that score goals. There really aren't many around Europe that score 20+ goals. In the top 5 leagues in Europe, the only wingers to score 12+ league goals this season are Mbappe, Palmer, Salah, Bowen, Foden, Son, Saka and Vinicius. Obviously most of these would be impossible to sign. Bowen will be nearly 28 by the start of next season so probably not the right age profile and he'd be expensive.
Even if the recruitment team does a great job, there's a very strong chance the winger they find might not develop into a superstar for 3+ years. He often gets criticised for his poor finishing, but there actually aren't many wingers with more than Garnacho's 7 league goals this season. Rashford in a terrible season, also has 7 league goals.