You can’t win ’em all.
And, if you could what would you learn from that?
It could be that you are in denial about some aspect of your life that you are hanging on to. The longer you cling to the false hope the higher the ultimate cost to you and perhaps others will be.
You might be involved in an escalating conflict in which pride or vanity is at stake that may end up becoming dangerous in a more physical or emotional way and you need to call a halt to it and come to terms with the other party before it gets too serious.
Sometimes you need to eat crow in order to stay in the game. Surrender on one front so you can continue fighting on another.
Accepting defeat is not the end of any important cause, just the beginning of rising out of smoke and dust wiser for the experience earned in the struggle imbued with the energy of justice denied. Or, you may walk away to find more winnable battles.