In the immediate future (2019-2055) temperatures globally will decrease causing colder winters and cooler summers leading to shorter growing seasons. However, in the long term temperatures will increase by 2.6 degrees Celsius by the year 2600 when they will decrease again. The increase is natural and not a result of human activities whose impact was not considered in preparing the paper.
A YouTube presentation of the paper with discussion and questions for those less scientifically oriented can be found at this link:
Grand Solar Minimum Interview with Valentina Zharkova June 27, 2019
So, for the next thirty years, things will get cooler, then solar irradiance will over-ride the cooling and things will get warmer. HOW MUCH cooler??