I don't have the button subscribers at the left side of my screen at all.
Welcome to the Atlassian Community!
This suggests that you were using Discord to talk to your community of people, and they have decided to move some, or all, of your conversations there to Slack.
You will need to follow the instructions they have given you for signing up for a new Slack account.
You'll need to provide a bit more context if you want people to help you.
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