Concerned about Microsoft’s recent decline

I bought 100 shares of Microsoft when the stock was trading around $420 per share, and since then it has continued to decline. While I originally entered the position with a long-term investment horizon in mind and believed in the company's fundamentals, the recent downward trend has made me increasingly concerned. Watching the value of my investment fall day after day is creating some anxiety, and I'm unsure how to respond. I'm debating whether it makes more sense to hold my current position, exit to limit further losses, or potentially buy more shares at lower prices to reduce my average cost over time.