What's a good selling strategy that maximizes profits and minimizes risks? How to sell as close to ATH as possible?
You should not expect to get a maximum profit as possible on thinking when to sell. No one knows what will happen next.
As long as you seem that profit is now good or does make sense to sell or anticipate that somehow a dip will happen soon based on their deep research and analysis, then I don't see any wrong on selling on the specific point.
Same goes for buying on dips.