Filtering by column headings

Hi

I have a range of columns with relevant data and would like to enable users of the reports to filter (using slicer or otherwise) by the column headers. They are participation figures so the data is split by region and year and each parameter is in a separate column.

Failing this if there is a way to reorder the information easily in PBI to have the data listed by region year and parameter (going from wide short table to narrow long table) that would be a possible solution either.

Thanks in advance.