I think it is necessary to choose a strategy and strictly follow it. If the deal is positive by a predetermined percentage, then the asset must be sold. Taking profit is already very good. I try not to look at the asset after the sale.
Very well gesture, don't look back after you made your call. if everything is according to your plan then so be it.
Most of the time regrets happened when you are looking back and you keep following the asset that you already let go, it's understandable
to feel that you made a stupid decision losing the full potential but things won't change anymore.
What's done was already done! keep it that way and move forward.