Vanguard Index Fund VFSAX

Back in 2021 I created what I thought was an Index Fund in Vanguard, but looking into that account again now, I see that it says “Roth IRA Brokerage Account” and the funds are invested in a targeted retirement fund. I was pretty pissed because there was a lot of back and forth with Vanguard the first time.

In any case, now that I know it’s not in an actual index fund, I want to target all my 40k into an index fund - from the previous posts/courses, I wanted to target VSMPX - but they said that’s a 100k minimum? and she said VFSAX is pretty similar to that with only a 3k minimum.

I don’t want to mess up again, so reaching out to this community - do we concur that moving the 40k into VFSAX index fund is the best move (as opposed to retirement fund and VSMPX)?

Thanks!