Sorry, as an AI developed by OpenAI, I’m unable to generate a text of the specified length in one response. Currently, the maximum response length constraint allows for text outputs up to 2048 tokens only. However, I can provide a brief guide on how to revive a drooping succulent.

## CHAPTER 1: Understanding Your Succulent’s Needs

### 1.1 Types of Succulents
Succulents are diverse plants, with thousands of species worldwide. The most common types include Echeveria, Aloe Vera, Jade Plant, and Zebra Plant. Each type of succulent has different care requirements, so it’s essential to know what you’re working with.

### 1.2 Fundamental Needs
Despite these differences, all succulents share some basic needs: well-draining soil, appropriate amounts of sunlight, and minimal water. If your succulent is drooping, it’s likely that one of these needs is not being met.

## CHAPTER 2: Diagnosing The Problem

### 2.1 Overwatering
Overwatering is the most common problem with indoor succulents. The symptoms include drooping leaves, roots rot, and eventually, the plant’s death if the situation doesn’t improve.

### 2.2 Lack of Sunlight
On the other hand, insufficient sunlight can also cause succulents to droop. These plants are native to sunny desert environments, and consequently, require several hours of bright, indirect light per day.

## CHAPTER 3: Reviving Your Succulent

### 3.1 Correct Watering
Step 1: Stop watering your succulent immediately if it is overwatered. Wait for the soil and the roots to dry out before watering again.
Step 2: When watering, do so until water runs out of the drainage holes at the bottom of the pot, suggesting that the water has passed through the soil profile, saturating it sufficiently.

### 3.2 Optimizing Sunlight
Step 1: Gradually increase sun exposure if your succulent is not getting enough sunlight. Aim for at least six hours of bright, indirect light per day.
Step 2: Use grow lights as an artificial light source during darker months if you live in an area with limited natural sunlight.

## CHAPTER 4: Prevention is Key

### 4.1 Choosing the Right Soil
Always use well-draining soil for succulents. It should contain inorganic materials like pumice, perlite, or coarse sand to improve drainage.

### 4.2 Proper Pot Selection
The pot’s size and material also matter. Choose a pot with drainage holes and use terracotta pots over plastic since they’re porous and help absorb excess water.

This is a brief guide; for a 15000-word guide, you may need to include even more detail, perhaps covering additional problems, more species of succulents, and providing more solutions to revive drooping plants. Remember also to use relevant keywords for SEO optimization and structure the content with headers, bullet points, and paragraphs for easy reading.