After describing the ultimate stable life in the previous verse, Isaiah dramatically changes the tone of the message, to indicate the seriousness and the ultimate danger of life in this world.
In Isaiah’s day, Judah sent ambassador after ambassador, seeking peace. And yet the results were never going to be peace, because this world is run by the devil himself, and he is not interested in pursuing peace with anything or anyone.
Hezekiah failed in his day, human history has failed throughout history, and in the tribulation, which is still future, the antichrist will not be interested in peace.
Christians, who are those who have believed in Christ, possess the title of ambassador from heaven.
Our real nation and true home, is in heaven. We are, as it were, on loan from God to this world.
But this world is not interested in God, not interested in truth, and certainly not interested in us.
As a result, life in this world will always be filled with heartache and hardship. And that will not change until the second advent of Christ.
History is said to be the angelic conflict. We as ambassadors, remain here until called home by Christ.
There will come a time, when two opposing nations are at odds, and conflict is inevitable, then the ambassadors are recalled, generally just prior to war being declared.
In the Christian life, we refer to that recall, as the rapture. Wherein, Christ will call us, and snatch us out of this world, leaving only unbelievers behind, and thus unleashing a terrible seven year period, which we call the tribulation.
The angelic conflict will finally reach its end, when Christ returns in his second advent.
Until that occurs, the world will be far from perfect, and will be constantly filled with burdens, with heartache, with sorrow, and so forth. And there is nothing you can do to make this world any better than that.
You can however, make your life better as an individual, by learning Bible doctrine and advancing to the stability of spiritual maturity.