I have been struggling with arrangement A LOT lately as well. In the beginning when I first started out making music, it was more idea flow and creativity. Now, when you step into learning how everything is done from the pros you think everything has to be done a certain way and lose a little bit of that side. My BEST advice is to listen to an artist in your same style and copy their arrangement for now. Once you're complete with the song you can switch it up and make some lengths longer or shorter. If you want even more help, go on youtube and loop up arrangement help. There are a few ways to turn 8 bar loops into music by copy and pasting the loop 20 times and then carving out the section in to intro, build, breakdown, chorus, etc. I like your song by the way. It reminds me of old school EDM.