How would you describe the shifting moods in the sonnet 29?

Sonnet 29 by William Shakespeare explores feelings of isolation, self-doubt, and envy in the first eight lines, then pivots to a more positive and hopeful tone in the final six lines with themes of gratitude, acceptance, and the redemptive power of love and friendship. The shifting moods reflect the speaker's journey from despair to a place of solace and contentment.