This is always a tricky subject. On one had i feel like Japanese developers should just focus on making games that appeal to the Japanese consumer. At least their fans are happy and of course the fans of Japanese games in the rest of the world are happy too, since we would be getting the experience we have come to love in the past, instead of the terrible attempts of their games pandering to western audiences. The problem with that is most of those probably won't get localized any where else, which sucks for fans of Japanese games in the rest of the world. It also sucks for the devs as they wouldn't be getting nearly as much money as they would have if their games were bought and were a at least a semi success in say Europe or NA.
On the other hand the idea of making games reach a broader audience sounds nice on paper, but i feel as they are just hurting themselves while trying to guess what the west wants. Honestly i think it just comes down to a culture difference. That barrier is a difficult one to break, especially now that there are many more Western developers and Wrpgs around. The Metal Gear Solid franchise did pretty well around the world and it is a great example of how successful a Japanese game can be, To anyone who has ever played a Metal Gear game, you can see the Japanese flare in the franchise. It doesn't have any of the norms that Westerners often complain about in Japanese games, but at the same time is Very Japanese in nature.
I think the West just has a bad image of Anime as most of the more mature and adult themed anime isn't often seen on television, rather, most people seem to think of anime as Dragonball Z, Naruto, Yu gi oh, ect. Many in the West view it as childlike and therefore shut themselves off a game before it is even really given a chance. Self fulfilling prophecy type deal. That's not to say that Japanese games aren't flawed. Jrpgs specifically (while i love em) suffer from extremely cliche dialogue that makes otherwise fantastic characters seem cheesy.
Let's not forget how much more Western games get advertised than Japanese games (at least in the US anyway, and of course with the exception of Nintendo IP's). I feel Japanese developers in general have their own unique ways of making games. They have a certain charm that I personally love. I really think the first step to making their games successful to other parts of the world would be to work on creating games with a more mature mentality in mind. Allow the characters, while still anime, to be older and masculine. Don't get me wrong i like games like the Tales Of series, but i'd like to see more Jrpgs with less cutesy characters and more bad*** characters. Once they get their plot and characters down i suggest they work on writing better dialogue. Then of course, advertise the hell out of it.
tl;dr
1. More mature themes/plot
2. More mature character designs/less feminine males (Less like Vaan and more like Basche and Vossler)
3. Less cheesy dialogue that doesn't make me feel embarrassed when a friend or family member is in the room while i'm watching a cutscene.
4. Advertise! Like a lot!
I'm no genius and I'll never claim to be, but i think even those 4 points would do wonders for Japanese devs.
Also, I left out things more common in Wrpgs such as dialogue options, tons of random quests, open world, ect simply because i've never been a fan of Wrpgs. I find they are quite boring and uncreative with generic plot lines and characters. Plus, i could never stand the aesthetics. Seriously, they have some good graphics but horrible aesthetics imo. I've always like Jrpgs better for their creativity, interesting (at least memorable) characters, and focus on the games story instead of wandering around.
But yeah, that last paragraph was more of my own personal opinions.