Go to your
SIMPLE_TRIGGERS.TXT file and find the following:
168.000000 4 520 3 1224979098644774912 360287970189639680 7 2123 3 1224979098644774913 1224979098644774912 200 2106 2 1224979098644774912 1224979098644774913 500 3 360287970189639680 7 1224979098644774912
Your current renown is divided by the
200 (ie, 0.5%), then the result is subtracted from your current renown. This happens once per week. To eliminate it, simply change the
200 to a very high number, such as 99999.
If you wanted to do it a different way, the
168.000000 is the number of hours between renown decreases (168 hours = once per week by default). Again, you could simply change this to a very high number, such as 9999.000000, and the renown decrease would only happen about once per year.