Should I add more stocks on my portfolio or just keep it as it is?

I currently have these stocks:
AMD@$166.7
ASML@€867
NVIDIA@$79.58
GRND@$9.95

YTD gain is about 16.48%, which is not bad compared to SPY given that I DCA-ed. I am quite optimistic that AMD and ASML will soon get back to their peak.

I am considering to add more stocks to my portfolio. But looking at my current gains, it seems my portfolio is not that bad, so shouldn't I just keep DCA-ing my current portfolio? I allocate about €2000 every month for stocks