There are a lot of different ecom/business niches that can be sold both as products and services or experiences. Some of the most common ones include:

1. Home and family services - This includes things like house cleaning, pet-sitting, and grocery deliveries.

2. Services for the creative industry - This includes things like photography, graphic design, and web development.

3. Fitness and wellness services - This includes things like personal training, yoga classes, and meditation classes.

4. Services related to food - This includes things like cooking classes, grocery delivery, and meal preparation services.

5. Services related to home improvement - This includes things like painting, carpentry, and renovation work.

6. Services related to pets - This includes things like dog walking, cat boarding, and dog daycare services.

7. Services related to children - This includes things like daycare, preschools, and after-school programs.

There are endless possibilities when it comes to niche marketing for ecom/businesses. As long as you have a good idea of what you're selling and how you can sell it better than your competition, you're on your way to success!
For any further questions, you can schedule a call so I can help you with my ecommerce experience.