Buy established players in their mids 20s or players who have shown they have real talent.
Buying players in their late 20s makes zero sense though, it's just money down the drain, money we cannot afford, Liverpool sold Coutinho for loads because he was young enough to have a huge market value, that's what we need to do.
Alongside that we can try and spot some young talents in the way that Chelsea, Spurs, Man City seem to and hope they make it.