If it is safe, it can be helpful to preserve evidence before deleting accounts, messages or profiles.
This might include:
- screenshots;
- usernames;
- profile links;
- dates and times;
- call logs;
- emails;
- payment information;
- a short chronology of what has happened.
Do not put yourself at additional risk in order to collect evidence.
And where content involves intimate images or potentially illegal material, seek advice before downloading or forwarding it.