Should I decrease Open_Cursors?

Hello. I'm new in Oracle DBA world. In task, my work friends offered to decrease open_cursors from 1000 to 400. In database maximum cursors is 22. So Should we decrease ? and Can we get performance in database when we decreased? Thanks. (We use Oracle 12c, ODA machine)

SQL> select
  max(a.value) as hwm_open_cur,
  p.value as max_open_cur
from
  v$sesstat a,
  v$statname b,
  v$parameter p
where
  a.statistic# = b.statistic#
and
  b.name = 'opened cursors current'
and
  p.name= 'open_cursors'
group by p.value;

HWM_OPEN_CUR              MAX_OPEN_CUR
------------          -------------------
22                           1000

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