Why are covid-19 cases rising world wide?

The worldwide trend in new covid1–9 cases is not good. As shown on
https://ourworldindata.org/coronavirus

the 7-day average of cases is up in many countries that have been experiencing fairly sever outbreaks for a while. The average is also up substantially in countries that were earlier held up as models for the proper response to covid-19.

Examples of the former are as follows:

United States up 106% from May 31 to Oct 1
UK up 349%
Spain up 1,909%
Italy up 339%

Examples of the latter are as follows:
Germany up 372%
South Korea up 73%
Taiwan up 600%

I realize some of the percentages are large because the denominator was so low. For instance 1 new case compared to 0 before yields infinity % growth.

However, I am becoming a little concerned about the trend. What do you think?