Need help asap 4th thru 6th gear is like neutral

Yea checked everything well didn't get to far yet with disassembly here's a pic
 

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Update shift fork came out of slot and the metal cylinder that slides into it came out nod went through tranny getting all new gears and forks
 
Guys I'm so lost I got a new set of forks and now every gear but 4th works so 5th and 6th is back but forth still gone I'm so confused I just wanna ride again