5 Years from retirement, what should I do?

Current Savings:
TSP:
C Fund – 168k – 63%
S Fund – 38k – 17%
I Fund – 44k – 20%

Vanguard:
Taxable: 72k – VT
IRA: 30k – VTWAX

Cash:
52k

Currently an E6 at 15 years, hoping to make E7 before I retire to up the pension a bit. Taxable investments and most of the cash holdings is due to profits from a home sale in 2023 (~100k). Currently stationed overseas so I don't own a house or anything. I know I probably shouldn't be holding so much cash, but it feels good and keeps the investing-averse wife happy. I know its easy to feel good about investments when the market is up, but I know it doesn't last forever. Is there anything I should be doing to prepare for that? I currently max out TSP contributions, but don't get a match due to being enrolled in the Legacy retirement system.