Not hearing back from a recruiter who wanted to schedule an interview?

Hey everyone, I applied to a well-known company at the end of November through their online application system, which tracks the status of my application. Since I noticed no updates, I reached out to the main recruiter last Monday. To my surprise, he responded a few hours later, inviting me for an interview and asking for my availability for this week. I replied within an hour with my available times, but since then, I haven’t heard anything.

Now that it’s the start of the new week when the interview was supposed to happen, what should I do next? Should I send a follow-up email, or since I found him on LinkedIn, would it be appropriate to message him there? Or should I just wait a little longer?

Any advice would be greatly appreciated!

Edit: I remembered that I followed up with an email the day after, clarifying my availability.