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To develop an MT5 expert advisor based on support and resistance/order block strategy with the following conditions, you need to specify the exact rules and conditions that you want the expert advisor to follow.
As per your requirements, the expert advisor should open and close trades automatically based on the predetermined Take Profit (TP) and Stop Loss (SL) levels. Additionally, it should also be able to determine whether to buy or sell on the areas of support and resistance + order block.
To achieve this, you need to define the conditions and candlestick confirmations that the expert advisor should use. Specifically, you have mentioned the Bullish Engulfing candlestick pattern as a confirmation signal. You should also specify the other candlestick patterns and technical indicators that the expert advisor should use to confirm the trade entry and exit signals.
Once you have defined the rules and conditions, you can then start coding the expert advisor in MT5 using the MQL5 programming language. You can use the built-in functions and indicators in MT5 to implement your trading strategy.
It is important to backtest your expert advisor thoroughly before using it on a live trading account. This will help you to ensure that the expert advisor performs well under different market conditions and is profitable over the long term.