Change horses in midstream
Definition 1 of 1
Pro Tip 1/3Planning Stability
The phrase suggests stability in plans is preferred over sudden changes. 
Our team decided not to change horses in midstream and stick to the established strategy.
Pro Tip 2/3Perseverance Encouraged
It captures the idea that perseverance is often better than starting anew amid challenges. 
Even though the research was tough, we didn't change horses in midstream.
Pro Tip 3/3Criticism Implied
Using this phrase can imply criticism towards someone who wants to alter plans. 
He wanted to overhaul the campaign, but I told him not to change horses in midstream.