Make yourself uncomfortable
This advice is aimed at improving masculinity and dominance, which will come in handy when dealing with male andrapoda as that's the only language they understand.
Always try to avoid comfort.
Start with your posture. How do you sit? How do you stand? Where do you keep your hands?
Have your spine and shoulders straight. If you are going to rest your hands on something, have as light a touch as possible. You should feel no or very little pressure on your fingers, hands and shoulders.
Crossing of arms is fine, as long as they remain uncomfortable. Practice this at home for extended periods of time. If others see you going from a comfortable to an uncomfortable position it will look comical.
When you sit, sit straight and do not lean on the back. You may want to lean a bit forwards.
When you speak, use your hands to articulate. Do not do big nor fast motions. Practice in front of a mirror. Speak slowly and eloquently. Always have a lower voice than the other person, both in frequency and volume. Don't be afraid to whisper.
When you walk, do not walk too fast and don't do jerky motions. Do not walk too slow either or you'll start to wobble from side to side and it will look comical.
Practice walking towards a mirror and making it look natural. You don't want any side to side wobble of your head. Don't look down or back.
When talking to another person, do not break eye contact. Stare them down.
If you are not talking to someone, do not make eye contact. If someone starts talking to you, take your time to make eye contact and to answer.
The more socialized the setting is, the less you will want to overtly display dominance.
In a business setting, you should show a tiny bit more dominance than the other party. Be it your client, your employer, your employee or your partner. Don't overdo it or you'll put them on the defensive.
With time, you'll get a feel for what is appropriate and what isn't.