It's been a long, long run. If you ignore the drop from last March that was recouped within months, it's been a strong ramp ever since the second half of the Obama presidency. Vanguard tells me I've done better than 16% over that period, just invested in the boring VTSAX index fund.

I might agree that general stock market prices are quite high, but arguing that "they went up 15% in 6 months" doesn't seem particularly strong. That has occurred historically, and doesn't automatically mean it's overpriced.

I’m quite new to it, so that’s reassuring to hear. September was when I made my first purchase.

just forget about it and never take the money out