2015 macbook air

I searched for this question but didn’t see it. I understand that the new Studio Display doesn’t support older Macbooks through the Thunderbolt 3 connector. That said, if I had a DisplayPort to USB-C cable should that work to connect the two? I understand it may not carry all of the features...

Hello. I've got an external 4TB hard drive that uses a thunderbolt connection, but I also would like to connect a monitor (via thunderbolt/mini-displayport). Problem is, it only has 1 Mini-Displayport/Thunderbolt port. Are there any workarounds? Could I use some kind of USB-3 to HDMI adapter...