1. Choose 2 Colors to Blend
These colors should be Analogous or Tints and Shades.
If they are complimentary or too far away from each other, they will create a neutral.
One should be darker than the other in order to see a slight change in color.
2. Use the DARKER COLOR and make a VALUE SCALE.
Make sure it is Smooth, Even, and has Contrast.
Take a "SEC" to check.
http://tabithaannthelostsock.blogspot.com/2019/09/value-scale.html
What is the lightest color? What is the darkest color?
This shows you the color wheel in grayscale...
3. Use the LIGHTER COLR over the ENTIRE scale, making sure you get rid of all white spots.
This is the main thing in blending the two colors.
See Videos of Above Steps here..
Learn How to Blend with 3 colors.