No reviews after 7 months of paper submission
Plenty of people have experienced the same situation. See e.g.

Submission review is taking too long

I submitted a paper five months ago. Should I wait a little bit more for a response?

Elsevier Review Speed

14 months waiting for first review time to go elsewhere?

In general: ask the editor pointed questions about what's happening to your paper. They might not be able to tell you when the reviews will be available, but they should be able to say things like "we've invited 4 reviewers of which 2 have declined". Ask them for that information, and perhaps when the review due dates are as well. With this information you can make educated guesses about how much longer it'll take to review your paper. If there's no sign at all that the article is being reviewed, then consider withdrawing and submitting your manuscript elsewhere.