The question was : changing out def gem for total offense, for me is total offence key in this question... And i didnt see a answer but im curious for it.

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I  have  personally  used  ,  Health,  Offense,  then  Defense.  This  has  worked  well  for  all  three  of  my  towns.  I  have not  checked  which  would  be  better  off  or  def.  Over  the  years  I  have had  good  success.  More  often  than  not  like  said  above,  it  depends  on  your  opponent.  Best option  prepare  your  troops  best  you  can,  spy  first  and  know  your  opponent.

I chose a strong army but the opponent is stronger in ca better way to improve.

There is a kind of hierarchy in offense/defense/health, however I found no difference at all between offense/defense/health. However depending on how they call the individual action, they get higher on the ladder. Everything increasing 'total ...'is the lowest on the ladder. Next up is likely your weapon choice. Then you have '...during defense/attack' etc. There are so many but I hope you get the picture. The more rare or complicated the action, the more power it has.

Gem choices are a matter of personal preference and fighting playstyle, as well as the type of events and defenses you face. Using a shorts Offense gem will increase your damage output and potentially help you get myou take, allowing you to potentially survive longer and defend more effectively, but it will also reduce your damage output. 

 I don't play games or engoffer some general advice that may help you make a decision.

When deciding on which gems to use in your fighting gear, it's essential to consider your overall strategy. Do you prioritize offense or defense? Are you trying to take out as many enemy troops as possible, or are you looking to protect your own troops and minimize losses?