Yes, you can add your zodiac sign back to your profile.
Here are the steps to do it:
- Go to in the bottom menu
- Scroll down to About Me section
- Tap the next to your nickname
- Tap on Birthday to edit
- Turn on Update My Zodiac Sign, then Apply
- Click Save at the top right corner to save the change
Please be aware that once you have started connecting with someone on Slowly, you will only have one chance to update your nickname, gender, and birthday; but saving the same birthday will not be counted as a change.