We managed to get a positive ROI from rounds $3,5,$ and $6.$ We should have taken a different strategy in rounds $4$ and $6.$ We were too confident in round $4$ to significantly change the approach based on what we achieved in round $3,$ which yielded a $2\mathrm{.}1\%$ ROI. Because of that, we agreed to change minimal on each area at round $5,$ which resulted in $3\mathrm{.}4\%$ ROI $(62\%$ improvement from $2\mathrm{.}1\%$ ROI$).$ Then, in the final round, our confidence turned to worry of having a negative ROI, so we almost didn$$t make any adjustment on the areas. what suggestion can you make from this