As you have a lot of actions, use color to denote importance of an action, not to differentiate between all the actions.

• Use main color to denote the main interaction element which has an action assigned. Or to give emphasis on the interactive element state.

• Use secondary color for a secondary action or to denote a section of the site, for example the header.

So in your case, a solution similar to 4. Use the main color for the primary action button, secondary color for the other actions.

Some sources:

Material design - Color  Material design - Accesibility

As you have a lot of actions, use color to denote importance of an action, not to differentiate between all the actions.

• Use main color to denote the main interaction element which has an action assigned. Or to give emphasis on the interactive element state.

• Use secondary color for a secondary action or to denote a section of the site, for example the header.

So in your case, a solution similar to 4. Use the main color for the primary action button, secondary color for the other actions.

Some sources:

Material design - Color 

Material design - Accesibility