In order for us to best help you, would you be able to share your shader or a screenshot encompassing all its nodes?
If you want to blend two textures, you may use the lerp node for that effect, and to apply tint you can use the multiply node, although we'd recommend considering having and using a separate grayscale texture for the intended effect.
Have you had the chance to rate and review Amplify Shader Editor? It would be awesome if you could share your experience with the Unity community, the Unity Asset Store thrives on user interaction and direct feedback.
Every bit helps, your feedback is extremely valuable to us!
Feel free to get back in touch if you have further questions or if you would like us to help promote your project once it is released, thanks!