What is better for this is to have a bot where you can automatically buy when certain conditions of your strategy have sufficed. Maybe with those three indicators that you have, RSI, MACD, and BB, you can all together just buy it and then wait for the percentage to sell.
Trading bots automate things and eliminate emotion in trading but people must learn fundamentals, technical indicators to set up trading bots.
Some good trading bot services are available to buy and use.
[BIG LIST] Crypto Trading Bots.
One of them is Gunbot that has an announcement thread in Bitcointalk.
🔥🔥🔥🔥🔥[GUNBOT] Trading Bot with 136 exchanges available!!!🔥🔥🔥🔥🔥