Who to speed up my Blogger

hello guys ,i have a problem and I don't know how to resolve it

i tested my blogger with PageSpeed insight and i get this score

61/100 —- poor for pc

51/100 — poor for mobile

How i can fix this issues

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 4 blocking script resources and 4 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for…

Who to speed up my Blogger