Narcissus worship?

Recently ive been thinking of making an altar for Narcissus i already have an altar for Apollon, and one for Ares. Maybe i feel more connected to him because i have the disorder named after him? (hense the username)

ive tried to ask Apollon, and Ares what they think of it, and all i got was mostly positive answers but vague enough to make it feel like its just my choice, and they dont mind. ive seen people talk about how they get advice from old greek heros/spirits, but its like tarot or regular divination you use for gods

(to my knowledge correct me if wrong) that doesnt really work with dead mortals, unless you summon/evoke them?

1: no idea how to do that. 2: just in my opinion summoning a dead mortal like that feels rude. So if i do make an altar just to honor him, i will probably do a heck of a ton of research before i even attempt to speak to him in any way shape or form.

also is he technically a demi-god or atleast has god blood if his father was Kephissos? (Or depending on what myth of him Endymion and Selene)