How do you paint a 6 panel front door without visible brush strokes?

Painted my 6 panel door that goes on to my screened in porch but all i can see is brush strokes and at night when i'm watching tv and look that way all i can see are the brush strokes is there anything i can put in the paint to stop this or just start using a foam roller? Where do you start first up down or side to side in between the 6 panels? 10-27-19/10 AM CST

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