Fiverr's gig thumbnail resolution

[creativesmith99]

According to fiverr:

 Recommended image size is 1280 x 769 px, 72 Dots Per Inch (DPI).
Minimum: 712 x 430 px
Maximum 4000 x 2416 px

But I have tried all these resolutions yet none of them works perfectly fine. It looks fine on desktop but looks cropped on mobile. Please help!!!

[al_amin_ar]

Fiverr Standard image size is 1280 x 769 px . should keep around the regulation.

[creativesmith99]

At 1280 x 769 px the thumbnails looks very pixelated and doesn't stand out much

[r_f_riyad_]

I have used 1600x1076 

[wordpresscoderr]

I have used image size is 1280 x 769 px,