I was trying to work out what I would do if I was them, or what I would advise them to do if I was their reputation manager. One of the issues I think they have is their need to make money. That massive house and the security issue are the two big money pits.
And public perception isn't getting better no matter how many times they try to explain their side of things - in fact it seems to make it worse. I don't think being in the Hollywood bubble surrounded by all the celebrity hustlers is helping their mindset.
If I was them I would come back to the UK (and suck up how hard that would be) use the kids education and desire to have them experience their British roots as the excuse.
They've got Frogmore which they are already paying for and as it's on Windsor Royal Estate that gives them a whole layer of security already there that they don't have to pay for. They can pay for private bodyguards when they are out and about.
I bet Charles would pay for his grandkids' schools, and possibly extra security for them too.
Harry concentrates on Invictus and the African Parks projects - he would be able to stay as a consultant etc on things like BetterUp, and would probably be offered other UK directorship type things with his contacts so that, alongwith selling the Montecito house would help with the money situation.
Meghan, I would advise go back to University and get a PHD in something relevant to her philanthropic interests, and as a side project start acting again in an edgy off-West End play.
Be seen shopping in Winsdor Waitrose, playing with the kids in the park, etc
A couple of years of that and Meghan uses her PHD to launch a related project - they will have had time to really network and get good contacts for fund raising.
Stop trashing the family, and having mouthpieces like Omid Scoble do it for them and in 24 months there would be no Sussex drama to criticise, no oxygen for the haters.