What is the signs of successful marketing strategic plan for new brand ?

the signs are

1- high brand knowledge : know about brand features and benefits 

2- high brand esteem : respect and loyalty to the new brand

3- high brand relevance : measure brand appeal

4- energized differentiation : how customers see that the brand is different

Thank you for addressing your question to me. In my opinion the measure of success is only by numbers for any organization. When the deliveries on sales and receipts are as planned then the strategy is considered to be successful.

that you have to find out they key of success factors in your business and compare it with your plan ,and what you achieved and what you will achieve