I put some of themse on my laptop and it makes, pretty!

There is a campaign which you can get a postcard if you purchase over 2,000 yen from New Year but I misunderstood that I thought it'stakenly thought that it had already started.begun.

MQuite sad! But maybe, I will go there again after the new year.

I went to my dream place

Finally, I couldmanaged to go to the One Piece shop!

I'm a big fan of One Piece so that is the only shop that makes me feel comfyortable.

I put some of them on my laptop and ithey makes my laptop look pretty!

There is a campaign in which you can get a postcard if you purchase over 2,000 yen, starting from New Year, but I misunderstood that Iit and thought it'sthat it had already started.

Maybe I will go there again after the nNew yYear.

Just keeping it consistent since you have "New Year" capitalized above.

I'm a big fan of One Piece, so that onlyonly that shop makes me feel comfy.

I put some of them on my laptop and it makesde it pretty!

“put” is in past tense, so “make” should also be past tense. It becomes “made”

There is a campaign in which you can get a postcard if you purchasespend over 2,000 yen fromafter New Years, but I misunderstood that Iand thought it's had already started.

I wWent to my dDream pPlace

I'm a big fan of One Piece, so that only shop makes me feel comfy/at home.

I put some of them on my laptop and it makes pretty. Now my laptop looks amazing with all these stickers!

There is a campaign in which you can get a postcard if you purchase over 2,000 yen from New Year but. Unfortunately, I misunderstood that because I thought it'the campaign has already started.

Maybe I will go there again after the nNew yYear.

I went to my dream place

I'm a big fan of One Piece so that only shop makes me feel comfy.

"comfy" is ok here, but you should know that it is very informal. It is used to shorten the word "comfortable" when typing on the internet or messaging friends, or, when spoken, to act cute with friends.

I put some of them on my laptop and ithey makes it look pretty!

There is a campaign through which you can get a postcard if you purchase over 2,000 yen fromduring New Year but I misunderstood that Iit and thought it's had already started.