You can use social media platforms to send newsletters. You can create a group on Facebook or LinkedIn to share updates. You can use messaging apps like WhatsApp or Telegram to reach your audience. You should consider using a blog to post regular updates. You can create a YouTube channel to deliver video newsletters. You can also use SMS services to send short updates directly to phones. You should explore push notifications for instant alerts. You can use apps like Substack or Medium for publishing newsletters online. You must choose an option that suits your audience and content goals.