The base kernel that zorin 16 was built for is the 5.11.27. If you are going to try another kernel i would start there. Zorin 15.3 had the 5.8 kernel...i wouldn't go back further than that since the Ryzen 7 would have minimal support, if any, before that.
Have you tried restarting gnome when you wake your pc? Do you have power management configured to shut off pci-e or your SSD's? Are the drives NVMe or sata SSD? This can matter in power management and returning from sleep.
I run zorin 16 on a Ryzen 7, 32GB RAM, two 1TB NVMe without the issue of system freeze after sleep. 5.11.38 kernel. It is possible.
Edit: you may have a gnome.