Follow below steps from moving lob segment from one tablespace to another.

SQL> ;
  1*  select table_name,COLUMN_NAME,SEGMENT_NAME,TABLESPACE_NAME from dba_lobs where OWNER=’DBACLASS’
SQL> /

TABLE_NAME     COLUMN_NAME  SEGMENT_NAME                       TABLESPACE_NAME
————– ———— ———————————- ——————————
FD_BREL_AUDIT PAYLOAD      SYS_LOB0000100201C00011$$          WEBMDATA

SQL> alter table DBACLASS.FD_BREL_AUDIT move lob (PAYLOAD) store as SYS_LOB0000100201C00011$$ ( tablespace USERS);

Table altered.

SQL>  select table_name,COLUMN_NAME,SEGMENT_NAME,TABLESPACE_NAME from dba_lobs where OWNER=’DBACLASS’;

TABLE_NAME     COLUMN_NAME  SEGMENT_NAME                       TABLESPACE_NAME
————– ———— ———————————- ——————————
FD_BREL_AUDIT PAYLOAD      SYS_LOB0000100201C00011$$          USERS