How to test hypotheses properly? [duplicate]

I have a homepage which I would like to change in some ways. I would like to place a commercial banner on it Ha. In this regard, I dont want the change to affect the traffic of the original page Ho.

I set up the hypotheses.
I set the criteria for a decision (alpha = 0.05)
I computed the test statistic
And found the insignificance of Ha.

However, I just realized that rejecting the Hadoesnt mean I can accept Ho, that is there is no significant impact on the original homepage. Could someone propose how to test that properly in order to access the impact on the original page.