Hello,

First, the !important is not a technique but a css rule to give priority to a certain attribute when the element targeted has already a style assign for that attribute.
But for it to work the most important and primary, is to have selected the right css class.
If the css class is not the right one then no matter what you add, it will not give any effect.
Please add this custom css code into your custom css box, to edit <h4> and <block quote>

vc_separator h4 {
    font-size: 26px !important;
}
blockquote {
    font-size: 24px !important;
}

PS: Please do NOT ever post login data in a public topic. Either write us in a private reply, or ad them into your profile data. So we can find them easy every time it’s needed.
I already removed them from the topic and filled in the profile information fields. Check it in your profile: https://support.codeless.co/?bbp_user=1711

Best regards!