sql tuning

I have one sql statement, I get sql plan from the sql_id which I don't like

SELECT SUM(amount), MAX(date_posted) from ar_debit where debtornum = :p1 AND (dtype_r = :"SYS_B_0" OR stmtnum = :"SYS_B_1")

SQL> select plan_table_output from TABLE(DBMS_XPLAN.DISPLAY_CURSOR('7c69j4d2kcj8y',null,'typical +peeked_binds'));

PLAN_TABLE_OUTPUT
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SQL_ID  7c69j4d2kcj8y, child number 0
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SELECT SUM(amount), MAX(date_posted) from   ar_debit where debtornum =
:p1 AND (dtype_r = :"SYS_B_0" OR stmtnum = :"SYS_B_1")

Plan hash value: 1585740249

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| Id  | Operation                     | Name           | Rows  | Bytes | Cost (%CPU)| Time     |