I used a katana, dual swords and warrior of the west 4 piece until I got to way of the wise. Try and get yourself the magatama that reduces set items required by 1 so you can mix and match some sets.
You can destroy all human enemies with tempest and with yokai get them confused and whack away. I used the first guardian spirit the dog and the first wind one the bird.
Most enemies are weak to certain elements but I found lightning is useful against almost everything.
Once I was in way of the wise I replaced that set with the etheral susano set.
Marobashi is a good to place to level and get some gear, also changing the stats on your weapons and armor with umbracites helps immensely.
If an enemy was really tough I used a lightning talisman and once they are under that elemental effect I would use a couple of guardian talismans until they get confused, then if you’re quick enough you will melt them before they can recover.