With technical analysis I think we can atleast narrow down the possible trend on where it is going either up, down or sideways just by looking at the chart but yeah since we are trying to be having a safe investment here then DCA would be the perfect strategy we can use as it is effective regardless of market condition.
Even with technical analysis and/or trading tools, it'll still be impossible to perfectly predict what trend or direction the market would take next, the best it can do for you is to narrow it down just as you've stated, or give you the possible options which the market would take, but it'll all be under probably as it's impossible to predict the future outcome of the market no matter the analytic tools involved, it'll still be a big gamble.
And yes, that's why DCA is a more preferable strategy, compared to timing the market, because it enables one to buy at different market conditions and prices, and with DCA you can be sure to buy more when prices are high and less when price is lower, and it'll help you also to accumulate a good chunk of Bitcoin without considering or being scared of the present market condition or short-term fluctuations.