How do you validate your GTM Efforts?

I am working on couple of my own products which are in the SaaS space. The initial traction was good but now it has become a little flat and want to know if I am doing the right GTM.

I tested it with one tool called RightSuite. Gave good results but not sure how useful it will be.

I am looking for other tools where I can compare data of this with others and take an informed decision.