I believe the best way to increase interest in Iron Fist is to combine the Asian MCU into a combined universe. Here's how I see them doing it. I get it doesn't tie in with Comic cannon but I think this is the best way to tie Iron Fist to the MCU.
Begin each episode with a flashback to an Immortal iron Fist, the first Episode should have Orson Randall, instead of WW1 he can be from Vietnam, it would make more sense because he would be a Heroine addict from Vietnam that stayed in SE.
Robert Meachum the man that betrays Wendall Rand (Iron Fist's father) and Heather Rand should be doing it on the orders of the leader of a Chinese conglomerate that wants to work with them. This could be introducing Mr. Khan, or the Yellow Claw. This character will later be revealed to have been working for Hydra, I believe the way his parents are killed needs to be changed for 1 major reason. What kind of a piece of shit dad would take a child and a mother on a death hike through the Hymilayas, whether or not you know there's a secret city. I feel like Wendall should have left mom and son in the small village before he attempts the hike with Meachum that's where Meachum kills Rand. But With little Danny and Mom in the village someone should be the hit man to kill him. This is where you tie the rest of Mystical china to Iron Fist, i think it should be the Mandarin, as a young hitman for Hydra before he begins the 10 rings terrorist organization. he would be played by a younger actor or he could be played by Ben Kingsley using CGi the way they do to make older actors look younger. (Remember Slattery got plastic surgery, obviously they wanted him to look like someone? The real Mandarin looks like Slattery, so he would be played by the same actor obviously. My theory is Killian thought the real Mandarin was dead thats why he took up the mantle.) The Hitman (the mandarin) kills Heather, then is searching for the young Danny, Danny has been trained in martial arts by his father so he can escape until the Hitman is subdued assumed dead. The man that saves them could be Yu-Ti the surogate father or man that raised Wendall Rand, but if you want to tie it to the Marvel Universe I suggest it is either Stick the former member of the hand that trained Daredevil (remember though the Hand is Japanese) or have it be the Ancient one the Sorceror Supreme. This would have massive ramifications for the Marvel Universe Danny Rand would have people to thank and it would help connect people to the Ancient One long before Dr. Strange comes out.
Now the Ancient One being such a powerful magical force would be able to pierce the veil and reveal Kun Lun and it would make sense for him to bring Danny to the city. When he gets there Yu-Ti and the Thunderer take him in.
I believe the show should episodically have Danny Rand Take out people he blamed for destroying his family. Then he will find out that Orson Randall the other guy that helped raise Wendall Rand and the guy that is the reason he's rich is still alive. Thats when you get the Tournament of the Immortals and at the end the great reveal that the Mandarin is also on his list. With Danny Rand fighting Hydra and the 10 rings. Below are some casting suggestions. Let me know what you think.
Chow Yun Fat as the Ancient One
Sonny Chiba as the Yu-Ti
Tim Kang as Lie Kung the Thunderer
Rain as Davos The Steel Serpent
Ken Leung as Mr. Khan
Jack Huston as Robert Meachum
Daniel Bruhl as Wendall Rand
Jeffery Dean Morgan as Orson Rand
Ben Kingsley as The Mandarin