Your  idea  has  been  asked  before.
I  would  say  it  has  been  asked  maybe  a  hundred  times  over  the  2+  years  I  have  played  this  game.
The  Players  in  the  community have  always  loved  the  idea  of  GH  reset.
All  the  posts  which  have  ever  been  made  about  GH  Reset  have  been  upvoted.
The  road  block  is  with  the  game.
Plarium  simply  doesn't  want  to  do  the  suggestion.
In  the  past,  A  moderator  said  a  reset  button  for  GH  wasn't  needed.
The  moderator  said  any  mistakes  you  make  will  correct  themselves when  you  max  out  your  GH.
I  don't know  if  this  statement was  the  moderator  opinion or  if  it  was  the  offical  response  from  the  managers/developers  as  to  why  they  didnt  want  to  implement  this  idea.
Regardless  of  the  above,  The  statement  given  does  have  merit.
Any  mistakes  you  make  in  GH  will  correct  themselves when  you  max  the  GH.
The  only  problem  is  it  takes  a  long  time  to  max  the  GH.
I  will  give  you  an  upvote  just  like  all  the  other  threads  which  had  same  idea.
Just  don't   put  all  you  hopes  on  this  idea  being  done.
Check  out  the  GH  Guide  I  wrote  in  Guide  section  of  the  forums
It can help  you  avoid  further  mistakes  in  the  mean  time.