Quote any line from the poem that express the poet's hope in Sonnet 29.

The themes of alienation, failure, self-doubt, self-loathing, envy at the success of others, hopelessness, and desperate loneliness are carried through the first eight lines of the poem.
Then a dramatic transformation takes place, and the poet moves from utter despair to the sheer, transcendent joy of being in love. The hopelessness, desolation, and misery of "When in disgrace with Fortune and men's eyes" are replaced by the hopefulness and promise of "Yet in these thoughts myself almost despising, Haply I think on thee" (emphasis added).
We can only surmise what's caused the poet to suffer such depths of despair, and we have no way of knowing—and the poet doesn't tell us, here or anywhere else in the sonnets, who the poet loves or by whom the poet is loved. It might be that the poet isn't referring to anyone in particular but to any or all of the people with whom he's experienced love—or simply to the experience of being in love itself.
Nevertheless, the poet tells us that he wouldn't trade his "state" of being in love and the "wealth" it brings to him with anyone or for anything in the world.