Here's a save file that has cleared the game, with this you can either start a new game plus on hard or legendary difficulty, and attempt both the Millennium tower dungeons, just as a note this isn't a 100% complete file. I have posted a guide like this for all the other Yakuza, Like A Dragon and Judgment games. Links to all of them can be found here and on my profile. The links can be found here and on my steam page:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2689025548
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2585769811
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2586740791
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2379715518
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2389968624
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2408950501
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2440359743
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2447367563
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2864943075
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2872921349

The Save:
https://drive.google.com/file/d/1oENBt8xySCvuL6ubZxVy_WQFXKZANVsm/view
https://www.nexusmods.com/yakuzalikeadragon/mods/105/

Please rate and favourite if these guides have helped you! Awards are nice too but not necessary.
Only one save file this time around, but you can use it for a bunch of things.

For some reason the save folder is in a different place this time around so reread the instructions if you have used one of my guides before. You will need hidden files to be visible, if you don't know how to do this, look up a guide.

After downloading the folder, unzip it using 7zip or winrar, inside is a folder called Yakuza 7 Saves open the folder and copy the save folders, go to the startbar and type %appdata% and click roaming, from there Sega, YakuzaLikeADragon, (your steam id) and then paste the save001 folder there. I recommend backing up your own saves, just incase. You might need to turn off steam cloud for Yakuza: Like A Dragon for this to work, to do that, right click on Yakuza: Like A Dragon in your library and go to properties and you will see a tickbox under steam cloud in general. Enjoy, kyoudais