First Command Escape

I've recently escaped First Command. I had a whole life insurance policy (cancelled) and two investment accounts: 1x Roth IRA and 1x brokerage account. Both have been transferred to Vanguard.

I don't like the funds that either of those accounts are in (First Command advisor accounts with outrageous expense ratios) and plan to change them.

I’m moving the Roth IRA to VTSAX based off some other posts here but I'm struggling to figure out what to do with the brokerage account.

I will be maxing the Vanguard Roth IRA and contributing 7% base pay to TSP (AD O-3).

The options for the brokerage account I see are: 1) Sell the brokerage account and buy into another fund I want. OR 2) Sell the brokerage account and live off that money for a few months while I commit 100% of my base pay to my TSP (to max this year). From my understanding, I can't lump sum into my Vanguard Roth or TSP.

Both options will be taxable events, as the only option I've seen to avoid getting taxed is to leave it in the current fund FNIAX (which I’m not willing to do).

All advice welcome! Thank you!