Hi there. Please be advised - in order to upload an original mix you must also upload the stems/samples. (It’s a remix site.)
Upload the original mix mp3 as the preview then add the stems or samples as ‘additional files’.
Here’s an example.

If you cannot upload the stems/samples you also cannot upload the mix.

ditto what Speck said. the music sounds good but doesn’t qualify as a sample on this site. if you upload the individual stems you’ll no doubt get some remix activity.

if you need help click on my name and send me an email from my profile page.