Reversal is not a trading it's just an illusion for any trader and over 70% traders gets trapped in this.
Trend trading is the only basic trading style in Forex and in Stock, all trends can be seen in weekly charts, trend tells the country's financial position or decisions if any currency facing high uncertainty it can not be suitable for trading i,e GBP, TUR etc.
Martingale can be effective only if your with trend otherwise trying to recover wrong decisions only.
Any trend can take reversal for some time like 7 to 15 days and sometime 30 days and best way wait and check best point for entry. 90% everyday calendar news can not turn the trend.
I'm not a guru but tried to explain a simple way and a sample way works in trade, more intelligence makes simple things complex.
H4 is far better then H1