As Arnaud said: " looking for a cross is tricky because it depends of the first point of the chart." I agree with that.
Something I do is that I use USD index and I compared it with the major pair I want to trade, for example if I want to buy EURUSD I wait to see a bullish tendency in EURUSD and a bearish tendency in the USD index, this will give you the volatility needed to have a good trade.
Here is an example of my last trade in H4:
Analysis in USD Index / Pair to trade
Entry in the pair to trade:
Something to keep in mind: If you are trading crosses you will need to analize the two currencies on the pair against the Usd Index, if you are going to buy EURCAD you will need to compared on the same chart of the USD Index the EURUSD and the USDCAD, that's why it is less complex to trade only with major pairs.