How to remove jailbreak?

I've been jailbroken on my old/broken(screen) iPhone 6s for a few months and it hasn't been a good experience so I would like to remove the jailbreak. The problem is that I can't seem to be able to download Electra directly from/to my Iphone (of tutuapp/tweakbox). My computer recognises my iPhone as i have just bought a new charging cable today (official from apple, not 3rd party), but iTunes/cydia impactor don't. Many of my iphones apps/abbilities don't work at all (appstore for example). Any help would be greatly appreciated.
Sorry for my bad english, sorry if this is stupid/annoying but i don't know what to do anymore as i'm not the most experienced with this kind of stuff.

Your best bet would be to just put the phone in DFU mode and restore it within iTunes. This will update the phone to the latest version and will erase everything, including the jailbreak.

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