The phrase "further impetus" means giving more encouragement, motivation, or push to something that is already happening or to continue a certain action. Full definition
The resurgence in global demand and world commodity prices from 2003 has since provided further impetus to resource - related investment. (rba.gov.au)
This year it has been given further impetus with the publication of Coalition and Beyond: Liberal reforms for the decade ahead. (conservativehome.blogs.com)
A Little Bad Luck For The Fed Too... As Trump's Deficit Spending Pressures The Dollar [providing even more incremental inflationary fuel]... Adding Further Impetus To Higher Yields. (globalslant.com)