Retired 5 years, All Funds in G?

I’m 60 and retired in 2020. I was worried years ago about market risk, so I switched to the G fund.

I haven’t touched any of it and realize that I’ve missed out on quite a lot of extra funds by keeping it solely in the G.

I have good savings but don’t have any additional IRAs, bonds or investment accounts.

I still don’t need to touch it for at least 7+ years and wondering if I should move it all (or like 80%) back to the C fund?

Thanks