First, we see the way the individual can be inspired and even bettered by a relationship with nature. The speaker talks about the "wealth" that has been brought him by the sight of the daffodils dancing in the breeze; when he recalls them, his "heart with pleasure fills, / And dances with the daffodils." He is delivered from sadness later, from his "vacant or [. . .] pensive mood[s]" by his memory of the lovely flowers that recall him to "the bliss of solitude."
Second, the speaker does highlight and emphasize the importance of spending time alone. Alone, he is able to recognize the "jocund company" of the flowers in nature without distraction by another person. The Romantics believed that solitude could help one to learn more about oneself and could give a person the opportunity to get away from what society dictates and learn to hear and hone their own thoughts and priorities.
Third, the speaker really focuses on his own feelings, showing the primacy of the individual and his or her experiences and emotions to the Romantic way of thought. The entire poem is comprised of the speaker's impressions and memories and the feelings inspired by them.