Isolate hosts on same VLAN - N1524

Hello all,

We are using a Dell N1524 switch on which we have configured multiple VLANs. We now would like to isolate the hosts on those VLANs, for example we don't want hosts1 on VLAN1 to be able to discuss with host2 on same VLAN.

From what I understand, on a switch, we can configure multiple primary VLANs, each of which can include a single isolated VLAN and multiple community VLANs.
So we can imagine creating a primary VLAN for each of our isolated VLANs.
But the problem is that a port in promiscuous mode can only serve one primary VLAN, one isolated VLAN and several community VLANs.

The fact is that we only have one port on the switch that is connected to the pfsense router.

Do you have any idea how I can do this?

Thank you,
Theo.