How to insert any view inside of another view?
OPTION 1
If you want to display it after your current view In Views, click on +Add button and select Attachment.
Now go to your page view in the FOOTER add Global: View area and select your attachment.
OPTION 2
Download and enable Twig Tweak
If you want this as a field, add a Global: Custom text and put:
&lt;dd&gt;{{ drupal_view('view_name', 'machine_name') }}&lt;/dd&gt;

Ex: &lt;dd&gt;{{ drupal_view('frontpage', 'page_1') }}&lt;/dd&gt;
OR
If you want to display it after your current view, in footer add Global: Text area, checkmark ☑ Use replacement tokens from the first row put &lt;dd&gt;{{ drupal_view('view_name', 'machine_name') }}&lt;/dd&gt; and select FULL HTML as your text formatt.