If we already understanding about price action will be not necesary to use indicator because from the historycal price we can decide which support and resistance area. I have seen many professional trader just use 1 indicator only for trading, the more important thing is knowledge about how to read price pattern.
See ? Pro traders also use indicator . so why we shouldnt be ? When indicators are a good way to aid us on our trading career . skills cant and experience are not enough to predict the outcome of the coins due to the changing nature of cryptos but at the end of the day , indications cant still guarantee you a secure profit because luck will still matter the most .