If you want to play Ghost of Tsushima: Director's Cut, one of the first things you might want to do is transfer your PS4 save to the PS5 version.
Use your PS4 first
If you have PlayStation Plus, you'll want to upload your Ghost of Tsushima PS4 save to the cloud first. You can do this by simply going to the game tab and pressing the Options button. You should see an option to upload your save data to online storage.
If you don't have PlayStation Plus, you can save your PS4 data to a USB flash drive. You perform a similar process as above, but save to a USB storage device instead of online storage.
By uploading the PS4 backup to the cloud or via USB, you can then transfer that data to the PS5.
Use your PS5 now
Before starting Ghost of Tsushima: Director's Cut on PS5, go to the PS5 settings menu. Once in the settings, click on “Save game/app data and settings“.
After that, scroll down and click on “Save Data (PS4)“. Click on “Online storage” or “USB key“. From there, you want to select the Ghost of Tsushima save file and “Upload to console storage”.
Start Ghost of Tsushima PS5 Now
Once done, start your version of Ghost of Tsushima on PS5. In the main menu, scroll down and click on the “Transfer PS4 Console Save”. Follow the prompts after that to select the save file you want to use to transfer to PS5. If done successfully, you can use your PS4 save data on the new PS5 console.