Please help, I don't notice the difference between 4k and 1080p??

You won't really notice a difference unless you're close to the screen, and, you are using a true 4k video source. Currently, this is only UHD movie discs (played in a UHD movie player) or certain games on the Playstation 4 Pro or Xbox One X game consoles.

Blu-ray is only 1080p, and will simply get upscaled by the TV. Regular HD TV is generally only 720p, and DVDs aren't even 720p at all. As with 1080p TVs, upscaling to 4k from lower resolutions will not result in a true 4k image, and may actually be WORSE than the original image without the upscaling.

As for the "soap opera effect", that's not due to 4k, but due to the TV's anti-blur circuitry. Even most 1080p HD TVs have this but most people turn it off since it can add lag to your video games and movies.

No, you won’t notice any difference unless you put your nose up to the screen and count the pixel density.

That’s because your TV screen is too small to show any benefit of 4K. It’s generally agreed that anything below at least 56” when viewed at regular comfortable viewing distances cannot show the benefit of 4K and to clearly see the difference it needs to be above a 60” screen.

The only reason smaller TVs come with 4K is marketing. Ignorant buyers will pay more to get what they think is better. It’s the same deal with cameras which boast ridiculously high megapixel counts compared to their tiny sensor sizes.

There is a setting in picture menu screen called TruMotion and you’ll need to play around with it.
I will say the model you probably have has a native 60hz panel and if the 1080p was 120hz panel then you’ll notice the soap opera effect.
120hz models will have both blur reduction and judder reduction feature and with both of these on will cause a soap opera effect.
60hz models will only have one of these features, and thus the soap opera effect isn’t as strong as a 120hz model.

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To benefit from 4k, get a 65 inch or larger screen.

I wouldn't spend the money on 4k.

an hd tv has 1080 horizontal lines and 1920 pixels per line ..
a uhd tv has 2160 lines and 3840 pixels per line ...
that is why we say it 4k ... both of them were doubled ... 2+2=4
in fact the number of pixels were increased four times ...
a 4k tv will show the finest if the channel or the movie and player are 4k
if you watch an hd movie on a 4k tv ... the two adjacent pixels and two adjacent lines are similar so it looks like an hd tv but more expensive than an ordinary hd tv ...
hope this helps you ... pardon my poor english