Accidentally placed a raw HTML into my page, now I can’t edit any elements

I used the following in a raw HTML block, now I am unable to edit any part of the website with TagDiv Composer.
It gives the following error message, however I already saved the current state of the site, so I can not undo this: “Errors at elements: 1(models) : 2(dom). The model does not match the content Current state has involved an issue. You could try an UNDO operation (CTRL+Z / CTRL+SHIFT+Z)”

Do you have any idea how I could undo or restore this?

The code that destroyed it all:

<div class=”wpb_wrapper”>
<div class=”td_block_wrap”>
<div class=”form-container” style=”background-color: #303030; color: #e5e1e6; padding: 36px; border-radius: 10px;”>
<div class=”text-center”>
<h3 class=”heading” style=”font-weight: 600; color: #e5e1e6;”>Hogyan dolgozhatsz velünk?</h3>
<p class=”description” style=”font-family: Roboto, sans-serif;”>
A részletes tájékoztatót emailben elküldjük neked!
</p>
</div>

<form id=”generic-lead-3″ class=”yikes-easy-mc-form yikes-easy-mc-form-3″ method=”POST” data-attr-form-id=”3″>

<!– Vezetéknév –>
<label for=”yikes-easy-mc-form-3-LNAME” class=”yikes-mailchimp-field-required”>
<span>Vezetéknév*</span>
<input id=”yikes-easy-mc-form-3-LNAME” name=”LNAME” class=”yikes-easy-mc-text form-control” required=”required” type=”text”>
</label>

<!– Keresztnév –>
<label for=”yikes-easy-mc-form-3-FNAME” class=”yikes-mailchimp-field-required”>
<span>Keresztnév*</span>
<input id=”yikes-easy-mc-form-3-FNAME” name=”FNAME” class=”yikes-easy-mc-text form-control” required=”required” type=”text”>
</label>

<!– Szolgáltatás –>
<label for=”c159849201″>
<p class=”form-field-description”>Szolgáltatás</p>
<label>
<input type=”checkbox” name=”group-c159849201[]” value=”2733791ea4″>
Marketing Mix modellezés
</label>
<label>
<input type=”checkbox” name=”group-c159849201[]” value=”64aa7eba3b”>
Digitális Marketing Audit
</label>
</label>

<!– Email cím –>
<label for=”yikes-easy-mc-form-3-EMAIL” class=”yikes-mailchimp-field-required”>
<span>Email cím*</span>
<input id=”yikes-easy-mc-form-3-EMAIL” name=”EMAIL” class=”yikes-easy-mc-email form-control” required=”required” type=”email”>
</label>

<!– Hidden Fields –>
<input type=”hidden” name=”yikes-mailchimp-honeypot” value=””>
<input type=”hidden” name=”yikes-mailchimp-associated-list-id” value=”628eb6958c”>
<input type=”hidden” name=”yikes-mailchimp-submitted-form” value=”3″>
<input type=”hidden” id=”yikes_easy_mc_new_subscriber_3″ name=”yikes_easy_mc_new_subscriber” value=”fd12f9525f”>
<input type=”hidden” name=”_wp_http_referer” value=”/”>

<!– Submit Button with Global Style –>
<button type=”submit” class=”yikes-easy-mc-submit-button button”>
<span>Tájékoztatót kérek</span>
</button>
</form>
</div>
</div>
</div>