While dedicated blogs specifically focusing on Usul al-Fiqh may be less common, here are several excellent resources offering valuable insights, academic content, and often in-depth articles related to Islamic jurisprudence.
Al-Madina Institute: https://almadinainstitute.org/ (Al-Madina offers well-structured academic courses, including modules on Usul al-Fiqh. Their resources often feature articles and blog-style explanations accompanying course materials, which are freely accessible.)
Islamic Jurisprudence: https://www.islamicjurisprudence.com/
Islamic Jurisprudence Academy: http://ijacademy.org/
The Islamic Texts Society: https://www.its.org.uk/
Islamic Legal Studies Program: https://www.law.harvard.edu/programs/ils/
The Institute of Islamic Jurisprudence and Legal Theory: https://www.ijjt.org/
Also consider looking into scholarly journals focused on Islamic law and legal theory. Such journals may contain advanced level articles exploring complex issues regarding Usul al-Fiqh. Libraries of educational institutions specializing in Islamic Studies are excellent resources for this.