You may want to look more into Kashmir Saivism. It is a very practical and at the same profound philosophical system which without denying the universe as something “illusory”, it takes it as real, being part of universal Consciousness, the ever blissful Siva. Sakti, the manifested part of Siva, is everything we experience. According to Swami Lakshmanjoo, Siva is the Subject. And there is only one Subject. The equivalent in QM, the mysterious “observer”.
Love and blessings,