How do you approach a stock buy when you see valued stock dip in price

I have setup a investment budget of 1000$ per month in which $400 goes to QQQM and rest $600 i use to pick which stocks i think are valued to hold for long term.

For this month i already invested $1000. I see SoFi stock trending low now and I want to load up more. What would you do in this situation?

1. Dip to savings and invest more as soon as you see an opportunity
2. Wait for next months budget to invest