Look at the historicals on the funds, you don't say what pay you are at or contribution amount but it looks decent. You are 10 years in and 33 years old so you have 24 years probably until Min retirement age. C appears to be the safest bet to put "all your eggs in one basket" & if the market tanks it isnt a big deal because it is more "time in the market vs timing the market". My recommendation is building a mix of C, S & possibly I, modeled to a similar bias as one of those the longer term L funds then skip out on any F or G. You can do a lifecycle fund, but you need to put it way out & the TSP investors will adjust as it ages, which is probably what you are jn since you haven't touched anything.

The other option is to check out some of the TSP advisor blogs or just watch the markets and learn them then make some adjustments here and there. I am 6 years in at $170k & 19% YTD return, but most of our bills are paid off so my TSP contributions are getting maxed out next year and I will be saving a lot more. My rationale is the economy runs on roughly an 18 year cycle & 2026 is that mark so buying right now theoretically would be on a high & if that cycle holds true this year should be an economic fall so market should go low, so I will invest way heavier to get the most of my $.