How to Balance Holding Cash vs. Investing in Stocks?

I have some cash on hand, and my mind keeps telling me to invest more in stocks. I have already deployed a portion of my money into the market, but I’m trying to stay disciplined and not make impulsive decisions. How do you balance holding cash vs. investing when the urge to put more money into stocks is strong? What strategies do you use to stay patient and make rational investment decisions? Would love to hear different perspectives!