EUR/USD strong Long call signal

Eur/usd month chat now have a strong buy in signal ,ema across bollinger basis line,

i know where to open a order,and follow the trend go,
but i don't know how to increase the margin with the trend go?

can any of you guys have a good strategy in increase margin for long time run? please share with us... thank you
let discuss together , leave your precious ideas on the comment

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