This Mindfulness Plus Plan comes with over 2,000 mindful practices, meditations, and sleep exercises with guided instruction from professionals, and a lifetime subscription is on sale right now for $69.99. It comes with guided meditation practices for all levels.
Mindfulness is a highly-reviewed, highly-rated meditation app that offers a ton of meditations and mental exercises. Of course, you have to find time in your day to dedicate to building your practice (meditation is a skill, after all), but Mindfulness comes with more than enough guidance to help you along your way. You can get a lifetime subscription to Mindfulness.com for $69.99 right now, though prices can change at any time.