Pyramid a winning trade is a very good idea to buy a stock that you already hold, than buying any new stock.
The market gives a lot of oppurtunities to enter in such a scenario.
I have marked all the important price points which are pullbacks on which can be bought by all the traders.
Ideally one should keep SL below the horizontal support and the low of the candle, and ride the wave till the move last.
This pyramiding can also give loss, so make sure the base is tight and maintain proper position sizing and risk manangement.