These are excellent tips that you have shared @bitrocker2020. I especially liked this sentence;

Some marketing expert told me once that retaining a client is harder yet more rewarding in comparison of obtaining a new one.

I really do understand this statement of yours. Once someone follows you, it won't be an easy task to keep them being loyal. They might lose interest and follow someone else. So, an extra effort is required just to make them always interested, and thats the hardest part.