发现401k里18%的钱是放在vanguard mid-cap value index fund (VMVAX)里,其它的都在fidelity 500 index里。VMVAX的YTD只有3.92%。现在大盘这么高,想请教一下,是把这个18%转到fidelity 500,还是转到vanguard small cap growth index (VSGAX),还是原地不动?