Query performance issue

explain

select  Count(a."individual_entity_proxy_id")

from "prospect" a

inner join "individual_demographic" b

on a."individual_entity_proxy_id" = b."individual_entity_proxy_id"

inner join "household_demographic" c 

on a."household_entity_proxy_id" = c."household_entity_proxy_id"

where (((a."last_contacted_anychannel_dttm" is null) 

           or (a."last_contacted_anychannel_dttm" < TIMESTAMP '2020-11-23 0:00:00.000000'))

                   and (a."shared_paddr_with_customer_ind" = 'N') 

               and (a."profane_wrd_ind" = 'N') 

               and (a."tmo_ofnsv_name_ind" = 'N')

                   and (a."has_individual_address" = 'Y') 

               and (a."has_last_name" = 'Y') 

       and (a."has_first_name" = 'Y'))

                   and ((b."tax_bnkrpt_dcsd_ind" = 'N') 

   and (b."govt_prison_ind" = 'N') 

   and (b."cstmr_prspct_ind" = 'Prospect'))

                   and (( c."hspnc_lang_prfrnc_cval" in ('B', 'E', 'X') ) 

   or (c."hspnc_lang_prfrnc_cval" is null));

-- Explain output

 "Finalize Aggregate  (cost=32813309.28..32813309.29 rows=1 width=8)"

"  ->  Gather  (cost=32813308.45..32813309.26 rows=8 width=8)"

"        Workers Planned: 8"

"        ->  Partial Aggregate  (cost=32812308.45..32812308.46 rows=1 width=8)"

"              ->  Merge Join  (cost=23870130.00..32759932.46 rows=20950395 width=8)"

"                    Merge Cond: (a.individual_entity_proxy_id = b.individual_entity_proxy_id)"

"                    ->  Sort  (cost=23870127.96..23922503.94 rows=20950395 width=8)"

"                          Sort Key: a.individual_entity_proxy_id"

"                          ->  Hash Join  (cost=13533600.42..21322510.26 rows=20950395 width=8)"

"                                Hash Cond: (a.household_entity_proxy_id = c.household_entity_proxy_id)"

"                                ->  Parallel Seq Scan on prospect a  (cost=0.00..6863735.60 rows=22171902 width=16)"

"                                      Filter: (((last_contacted_anychannel_dttm IS NULL) OR (last_contacted_anychannel_dttm < '2020-11-23 00:00:00'::timestamp without time zone)) AND (shared_paddr_with_customer_ind = 'N'::bpchar) AND (profane_wrd_ind = 'N'::bpchar) AND (tmo_ofnsv_name_ind = 'N'::bpchar) AND (has_individual_address = 'Y'::bpchar) AND (has_last_name = 'Y'::bpchar) AND (has_first_name = 'Y'::bpchar))"

"                                ->  Hash  (cost=10801715.18..10801715.18 rows=166514899 width=8)"

"                                      ->  Seq Scan on household_demographic c  (cost=0.00..10801715.18 rows=166514899 width=8)"

"                                            Filter: (((hspnc_lang_prfrnc_cval)::text = ANY ('{B,E,X}'::text[])) OR (hspnc_lang_prfrnc_cval IS NULL))"

"                    ->  Index Only Scan using indx_individual_demographic_prxyid_taxind_prspctind_prsnind on individual_demographic b  (cost=0.57..8019347.13 rows=286887776 width=8)"

"                          Index Cond: ((tax_bnkrpt_dcsd_ind = 'N'::bpchar) AND (cstmr_prspct_ind = 'Prospect'::text) AND (govt_prison_ind = 'N'::bpchar))"