I think one should find a comfortable trading strategy first then refine it to include things like best time periods to trade, if one believes the gains benefits would help improve their strategy.
For example my strategy open times look like this. (See image)
View attachment 11486
You'll notice the image don't include the 7 different currency pairs my strategy is based on, nor the closing times or remaining open orders, so again refining these might also help improve this strategy, and so on.
of course every strategy is different and every traders is different which is why I stated that there is no such thing as the best time to trade as a general timeframe. For each trader it will be different.