Varnish always shows miss on my website
I have put all the cacheable=false and isScopePrivate=true and setNoCacheHeaders in my website but he still shows miss

This is the head of my website：
    Accept-Ranges:
bytes
Access-Control-Allow-Origin:
*
Cache-Control:
no-store, no-cache, must-revalidate
Cache-Control:
public, must-revalidate, proxy-revalidate, max-age=0
Content-Encoding:
gzip
Content-Length:
28621
Content-Security-Policy:
upgrade-insecure-requests;
Content-Type:
text/html; charset=UTF-8
Date:
Wed, 21 Jun 2023 04:04:19 GMT
Expires:
Thu, 19 Nov 1981 08:52:00 GMT
Pragma:
no-cache
Server:
nginx
Set-Cookie:
PHPSESSID=l1spnb7aft9fckj58u8qrehlhb; expires=Wed, 21-Jun-2023 05:04:18 GMT; Max-Age=3600; path=/; domain=www.instar.ro; secure; HttpOnly; SameSite=Lax
Set-Cookie:
X-Magento-Vary=091a9fa2c6d313546d7e81c15fe4cf7f3931e814; expires=Wed, 21-Jun-2023 05:04:19 GMT; Max-Age=3600; path=/; secure; HttpOnly; SameSite=Lax
Set-Cookie:
form_key=PMFgVNSYqhgRYnhC; expires=Wed, 21-Jun-2023 05:04:18 GMT; Max-Age=3600; path=/; domain=www.instar.ro; secure; SameSite=Lax
Strict-Transport-Security:
max-age=31536000
Vary:
Accept-Encoding
X-Content-Type-Options:
nosniff
X-Content-Type-Options:
nosniff
X-Magento-Cache-Debug:
MISS
X-Xss-Protection:
1; mode=block
X-Xss-Protection:
1; mode=block