is it possible to modify identify columns start with value in PostgreSQL 13
You can use setval() to change the current value of the underlying sequence.
To get the sequence's name use pg_get_serial_sequence()
select setval(pg_get_serial_sequence('public.rss_sub_source', 'id'), 1234);

or more dynamic:
select setval(pg_get_serial_sequence('public.rss_sub_source', 'id'), max(id))
from public.rss_sub_source;

Online demo