Oh hello!
I see you are new to this mapping
Okay, do not worry!
I will gladly show you all the wonderful world of mapping ...
I will try to explain each point in the best possible way ..
(To understand that my English is not good)
(And also that mapping is not something that is learned in a day, it can take a long time .. u.u)
Okay...Let's do this!
The BMP Is : 142,000
and the Offset: 301
First, for this to be an easy has too many stars ..
Press Ctrl + Shift + A (There you will open the AiMod, where you will see the errors of your map) (From Preview point to the Distance Snap) In the part above you will see the difficulty that your map has there, it will say "Normal" if this is an easy it should say "Easy" right ?, do not worry I'll help you lower the stars ..
Now .. What is the "Distance Snap" Is the distance between the notes, as it says, Hold Alt, and with the mouse wheel adjust the distance between notes, the best for easy is between 0.80 and 1.2Now, on the right side of the screen, you will see an option that says "Distance Snap". Activate it and keep it activated for the entire map. In the easy and normal diffs, you should always keep the distance function activated.
Now let's see, the preview point, how is it placed?
Very easy! Let's see in the top part where it says "File" "Edit" "View" "Compose" "Desing" "Timing" "Web" and "Help" Click on "Timing" and go to the last option "Set current Position as preview Point "
Let's go to "Song Setup" and "Audio" listen to the different Hitsounds that the game brings, and look what could get better in this song, also lower the volume to the hitsounds, they become very annoying when they are very loud 
For me, I think the best hitsounds for this song could be "Drum" I think it's the one that is best heard for this song, but it's of your clear taste 
Now let's see ... What is the Kiai Time? is the strongest moment or the chorus of the song, How can I place a kiai time? much easier than the preview point ...The kiai part is this ..
Starts at 00:53:066 - and end in 01:04:981 -
Start over here 01:06:683 - and end in 01:23:705 -
(In some songs there may be more than one kiai mode)We go to the "Timing" part and go to "Timing Setup Panel"
Here Click and Click on the plus sign,"+"
Then go to "Style" and click on "Kiai Mode" so easy, then to deactivate the kiai time we go to the part where the chorus or part ends and we do the same thing only by deactivating the option of "Kiai Mode"You also have to lower the volume a bit to kiai mode, since there is also the "Audio" part, as I said it can be very annoying if they are too loud 
It is better that you erase everything you did, to be able to place the changes, try to ALWAYS follow the white bars, these bars are the rhythm of the song, and you always have to follow them 
These white bars that you see here? They are the rhythm of the song always follow them, You can also place hitsounds to the circles on the right side of the screen (Where you have the "Distance Snap") Have the different Hitsounds "Clap" "Finish" "Whistle", place them while you do the map, always to the rhythm, and remember to keep the Snap distance activated, if you have any questions, do not hesitate to add me and I will try to explain it to you, and if you have not understood something... TOO! or you can just reread what I have put------------------------------------------------------------------------------------------------------------------------------------------------------------------
Okay Dude...
that's all for now, then I'll go back and see how you've improved!
bay