Snapchat's best friends list was based on the frequency and recentness of your interactions with other users. It is not possible to manually remove someone from your best friends list without affecting your streak with them, as the list is generated automatically by Snapchat's algorithms.
If you want to keep the streak with that person but don't want them to appear on your best friends list, there are a few things you can try:
Start Snapping with Other Friends: By increasing your interactions with other friends on Snapchat, you may push the person you want to remove from the best friends list down the ranking. This could result in them no longer appearing on your best friends list.
Snap Privately: If you have a streak with the person you want to keep but not display on the best friends list, make sure to exchange snaps privately, rather than sending them through your Story. Snapchat's algorithm places higher importance on private snaps for the best friends list.
Increase Streaks with Others: If you have other friends you want to maintain streaks with, focus on increasing the number of consecutive days you snap with them. As the number of days in a streak grows, it can push other users down your best friends list.
Remember that Snapchat's features and algorithms might change over time, so it's a good idea to check for any updates or new options related to best friends and streaks in the app's settings or support documentation.
Lastly, it's essential to communicate openly with your friends about your preferences regarding streaks and best friends. Understand that everyone uses Snapchat differently, and your friends may have their reasons for using certain features. Being open and respectful in your communication can help maintain healthy relationships both on and off the app.