Just for clarification as reading your post I think you...

Just for clarification as reading your post I think you misunderstood, by price and volume I mean the chart with just price bars/candles and volume along with some moving averages, no RSI, MACD etc.

The purpose of technical analysis imo is to identify accumulation and/or distribution, that shows up in price patterns and is confirmed by volume patterns, how price interacts with key moving averages also gives some clues(note I am not using MA crosses or other lagging methods). If a stock is going to go up in a sustainable trend, it's going to be accumulated by instos/funds/brokers/family offices i.e those with the money to soak up a large amount of stock and then drive the price higher and support it in the pullbacks. When those people are buying you can see it as the base forms, just as when they are distributing it, the price patterns will generally form a certain way and this will be confirmed by higher volume in the selling bars