immagine del profilo
If I have shares, I buy for a maximum of €10k, but generally let profits run. However, if the share's profits rise so much that an individual share accounts for more than 5% of my portfolio, I would also sell part of it to reduce the risk.

In the past, it was always enough for me to only buy other stocks in my portfolio to keep the weighting within limits.
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immagine del profilo
@KevinE I have handled it similarly so far and the thought has already occurred to me, but the rise has been so furious that I probably wouldn't even have made up for it in 3 years purely through purchases if the share price had changed by 0% in that time.