Stolen iPhone

Hi, hope you can help.

I have had my IPhone 13 Pro Max stolen.

I have blacklisted the IMEI but I am looking for more options for the device to become useless in the hands of whoever.

I had registered it with Apple for warranty purposes.

I unfortunately did not have the Find My app enabled.

I have logged into ICloud on my PC and strangely my device does NOT come up but my pictures and contacts are stored on ICloud and accessible on my PC.

What I am able to do is log into Apple ID on my PC and it appears on as my device with all the correct serial numbers etc.

Is there a way of being able to find my iPhone online? Can it be iCloud locked?

Thanks in advance for any replies and any future purchases of iPhone will always be FindMy enabled.

Mr N