SQL on iSCSI with SSD Hotspots?

Hi,

We are currently setting up a datawarehouse with SQL 2017 Std and SSIS. I tried to run it on my bulk-storage over iSCSI but the performance was too slow, so I went for the other extreme an put it on a local SSD RAID 6. Not a suprise: it‘s screaming fast now.
But we expect it to grow by 1TB a year which I obviously don‘t want to store on my expensive servergrade SSDs.
Redesign the DWH to offload data to an archive-db after a while would pretty much kill our project plan.
So: is there a possibility to teach SQL 2017 to store the data on my SAN and keep frequently used data on a local SSD in the same database without manually move the data?
TIA
Falko