Thanks for posting in the Spotify Community!
If you haven’t already, I would recommend first reading this Spotify Answer about what you need to know before submitting an idea to the Idea Exchange.
You can then read about how to submit your idea here, where you’ll find a submission link under “How do I submit my idea?”. After entering a subject and clicking “Check Title,” make sure to first see whether any existing ideas have been submitted already that match your suggestion. If none of them match your suggestion, you can scroll to the bottom of the page and click "Continue and Post."
The more votes an idea gets, the likelier it is that Spotify will implement it; and you can read more about how feedback on ideas reaches Spotify here.
Let me know if you have any other questions, and have a good day!