opjose

Keep at it until you don't even think about which way you move the stick, if the plane is coming or going.

You'll be ready for real world upright flights then.

Next practice inverted flying on the sim until you don't think about it this way as well.

Then move onto flying the plane out in the sim or reducing the view until the plane is a dot in the sky, so to speak.

Learn to control the plane not by it's orientation, but by it reacts to stick inputs.

This last thing is one of the most important skills a sim can teach you.

Sooner or later you loose orientation of your real world plane ( aka "dumb thumbs" ).... by practising in the sim, you'll be ready for this.