Where to share my product development

Hi All, My name is Simone and I am currently working on a physical product and wanted to ask what platform do you think would be best for me to use to share my product development.

The product is going to be a well made reusable nespresso coffee pods that will help people save plastic waste, while still enjoying a fantastic cup of coffee.

As part of the product, I am looking to create a small audience that will probably be my first customers, but also help me in making developing a great product (I will be giving product for free to try in different cofee machine and share feedback).

I am currently on Twitter and have over 5k followers, but I am not sure they are the correct audience and I am wondering if I should move to Instagram for this or where else?