Hello,
Was there a migration which was done from SEP 11.x?
You may edit the firewall policies to disable logging for any rules where this is no longer needed.
Secondly, In SEPM >> Admin >> Servers >> localhost >> Edit Database Properties >> Log Settings
Change the 50,000 entries change that to 10,000 or 5000
The traffic Logs would be set for 60 days change that to 10 days
Then it should bring down the size.
Hope that helps!!