Not hearing back from a recruiter about a scheduled interview?

Hi everyone, I applied to a large company at the end of November through their online application system, which tracks the progress of applications. Noticing no updates, I reached out to the main recruiter via email last Monday. To my surprise, he responded just a couple of hours later, inviting me to an interview and asking for my availability for this week. I replied within an hour with my open times, but since then I haven’t heard anything.

Now that it’s the new week when the interview was supposed to take place, I’m wondering what my next steps should be. Should I send a follow-up email, or I could also message him on LinkedIn? Or should I just wait a little longer?

Any advice would be greatly appreciated!

Edit: I remembered that I sent another email the following day to clarify some of my availability.