Aside from the fact that a lot of people, myself included, feel Reddit is actually really hard to use... Reddit's style is much older than the current 'out of date' forums and borrows a lot from the newsgroups of old.
The one thing it really does have going for it is the ability to 'make a subreddit', aka portion off a piece of space yourself where there are already a lot of users. Cloning Reddit won't fix the problem that Reddit already has users and any Reddit clone might clone the software but doesn't automatically bring users with it.
tru tru but how can forums change I genuinly believe they are dying unless you build one in 2007-2008 those will thrive because they have been grandfathered in however creating one in 2018 good luck with that! (not trying to be mean but it is very hard to start a forum in 2018 unless possibly a forum for ad space or among your close friends but other than that)
You're starting from the position that forums have to regain their former glory; they absolutely don't. It's also presumptive to suggest that Reddit is the direction forums need to go it - it really isn't for all kinds of forums.
There will always be room in the market for forums for specific purposes, e.g. support forums for a company, or people with specific niches wanting to reach out. Of course, having niches where privacy is important will always be a thing and forum software still makes that possible.
There is also the situation where a niche needs tools and customisations to make it work well that don't exist on either social media or even conventional forums; spaces like roleplay need tools that only sort of exist in the mainstream platforms but it's inherently a niche use case from the off.
I still think the road to success is for forum platforms to diversify and stop trying to recapture the glory days. Decide what the platform wants to be and build for it - IPS builds for combinations of tools being available, XF for forums that can standalone or be integrated. I'm building for the roleplay segment. That's how forums should change: specialisation.
Reddit to me means group forums with up/downvotes, multiple languages, wrapping external pages.
I don't think there is anything like that. it has been a long time I last played with social engine though. PHPFox tried something along those lines but when I tried it years ago it was not getting there. Going custom with Django framework may be a solution.
What do you want exactly? User created forums? Up/down voting? Front pages generated from number of up/down votes instead of a list of forums?
It would be easy to modify any current forum software for all of those but the problem is most people do not want those features so they haven't been created. If you really want software like this you'll probably have to pay for someone to develop it for you if you can't do it yourself. Alternatively use the Voat or reddit source code.