In no small measure
Definition 1 of 1
Pro Tip 1/3Positive Impact
The phrase often attributes positive outcomes to causes or efforts. 
Their teamwork contributed, in no small measure, to the project's success.
Pro Tip 2/3Implicit Intensity
It implies a significant role without directly saying 'big' or 'large'. 
Your advice has helped, in no small measure, to shape my decision.
Pro Tip 3/3Collocation Usage
Best combined with words like 'due', 'contributed', or 'helped' to indicate causality. 
The volunteers have, in no small measure, made the event possible.