Help with query optimizer

Hello Experts!

Can you please help with the attached query as it is taking time to
execute. The execution plan for the same is below:
Thank you!

Nested Loop Left Join (cost=8176.99..168603.11 rows=1 width=294) (actual
time=3301.886..3303.715 rows=0 loops=1)
Join Filter: (conversation.id = "jobReminders"."conversationId")
Buffers: shared hit=743696 read=78069 dirtied=16 written=10
I/O Timings: shared read=7224.068 write=0.287
-> Gather (cost=8176.99..168472.90 rows=1 width=246) (actual
time=3301.885..3303.711 rows=0 loops=1)
Workers Planned: 2
Workers Launched: 2
Buffers: shared hit=743696 read=78069 dirtied=16 written=10
I/O Timings: shared read=7224.068 write=0.287
-> Nested Loop (cost=7176.99..167472.80 rows=1 width=246)
(actual time=3286.866..3286.874 rows=0 loops=3)
Buffers: shared hit=743696 read=78069 dirtied=16 written=10
I/O Timings: shared read=7224.068 write=0.287
-> Nested Loop (cost=7176.56..61685.83 rows=59320
width=174) (actual time=68.447..1978.593 rows=57917 loops=3)
Buffers: shared hit=284214 read=56135 dirtied=11
written=9
I/O Timings: shared read=4546.889 write=0.242
-> Hash Join (cost=7176.13..20450.20 rows=15571
width=142) (actual time=68.196..211.016 rows=17903 loops=3)
Hash Cond: (conversation."mailBoxId" =
"mailBox".id)
Buffers: shared hit=7428 read=11254 dirtied=9
written=3
I/O Timings: shared read=85.214 write=0.085
-> Parallel Hash Join (cost=6944.87..20143.53
rows=26942 width=118) (actual time=67.736..197.476 rows=21937 loops=3)
Hash Cond: (conversation."taskId" = task.id
)
Buffers: shared hit=6678 read=11254
dirtied=9 written=3
I/O Timings: shared read=85.214 write=0.085
-> Parallel Seq Scan on conversations
conversation (cost=0.00..13029.34 rows=64502 width=102) (actual
time=0.017..79.191 rows=51677 loops=3)
Filter: ((NOT "isCompose") AND
("parentConversationId" IS NULL) AND (id <>
'559702f9-55a8-47c7-9b5c-93b29baabf3d'::uuid))
Rows Removed by Filter: 622
Buffers: shared hit=3605 read=8608
dirtied=5 written=3
I/O Timings: shared read=57.862
write=0.085
-> Parallel Hash (cost=6583.67..6583.67
rows=28896 width=16) (actual time=67.046..67.047 rows=22266 loops=3)
Buckets: 131072 Batches: 1 Memory
Usage: 4224kB
Buffers: shared hit=3073 read=2646
dirtied=4
I/O Timings: shared read=27.352
-> Parallel Seq Scan on tasks task
(cost=0.00..6583.67 rows=28896 width=16) (actual time=0.015..48.469
rows=22266 loops=3)
Filter: (("deletedAt" IS NULL)
AND (type = 'MESSAGE'::enum_tasks_type))
Rows Removed by Filter: 32166
Buffers: shared hit=3073
read=2646 dirtied=4
I/O Timings: shared read=27.352
-> Hash (cost=230.80..230.80 rows=37 width=24)
(actual time=0.382..0.383 rows=37 loops=3)
Buckets: 1024 Batches: 1 Memory Usage:
11kB
Buffers: shared hit=690
-> Seq Scan on "mailBoxes" "mailBox"
(cost=0.00..230.80 rows=37 width=24) (actual time=0.021..0.367 rows=37
loops=3)
Filter: (status = ANY
('{ACTIVE,SYNCING}'::"enum_mailBoxes_status"[]))
Rows Removed by Filter: 27
Buffers: shared hit=690
-> Index Scan using idx_message_fk_conversation_id on
messages (cost=0.42..2.53 rows=12 width=48) (actual time=0.035..0.096
rows=3 loops=53708)
Index Cond: ("conversationId" = conversation.id)
Buffers: shared hit=276786 read=44881 dirtied=2
written=6
I/O Timings: shared read=4461.675 write=0.156
-> Index Scan using "mailMessages_pkey" on "mailMessages"
"messages->mailMessage" (cost=0.43..1.78 rows=1 width=88) (actual
time=0.022..0.022 rows=0 loops=173750)
Index Cond: (id = messages."mailMessageId")
Filter: (("mailId")::text = '<
CAMWt+ZZk_vSuuRU7Wzw76wh4JQLd2i3ZKh7h2+ES4jsjMHsYJQ(at)mail(dot)gmail(dot)com>'::text)
Rows Removed by Filter: 1
Buffers: shared hit=459482 read=21934 dirtied=5
written=1
I/O Timings: shared read=2677.179 write=0.045
-> Seq Scan on "jobReminders" (cost=0.00..129.90 rows=25 width=48)
(never executed)
Filter: (status = 'PENDING'::"enum_jobReminders_status")
Planning:
Buffers: shared hit=105 read=1
I/O Timings: shared read=0.010
Planning Time: 2.250 ms
Execution Time: 3303.810 ms
(61 rows)