I am making my way through Yakuza series right now and while playing 5 I realized that I am not that invested into the game’s combat, so I turned it to easy and that just streamlined the combat so much for me. I would recommend to maybe try Yakuza 0 on normal at first and then just switch it to easy if you feel like the gameplay might be dragging on.
I just wall myself up inside with a gate and wait out the sieges. I also place two dogs outside the main entrance to catch kidnappers. Has the same effect without needing to mod the game or alter the settings.
Of course once I can build ballastas or make use of water/lava, I can set up winding paths with Dwarven Shotguns (basically using water pressure and garbage I can fire minecarts full of crap at high speeds) to obliterate trespassers.