mobile usability error in Google Search Console

Hi,
The google search console is showing mobile usability error in sitemap (link- https://www.couponslord.com/sitemap.html)

It’s showing 3 errors:
1 – Text too small to read
2 – Clickable elements too close together
3 – Viewport not set

Google search console error screenshot – https://prntscr.com/uhgbkl
1 – Text too small to read – https://prntscr.com/uhgd1b
2 – Clickable elements too close together – https://prntscr.com/uhgdx6
3 – Viewport not set – https://prntscr.com/uhgeb9

Could you please solve this issue ASAP?
Or else, please tell me how can i solve it myself?

Waiting for the solution.

Have a great day.

Thanks

The page I need help with: [log in to see the link]