• why don’t you recycle SQL error log by exec sp_cycle_errorlog.

    SQL will recycle the log and the physical log file will be inactive (it can be deleted).

    my recommendation would be .....recycle the error log.....delete the old files (so that you can have free space back on disk)

    now monitor if the error log is still growing. if so that go through the logs and see what causing it to grow. Hopefully it should be fine after recycle.