I have tried contacting Lucifer a few times:
Twice with two different sigils;
Two more times with two different sigils while using the enn;
I have also tried to sleep with the sigil under the pillow, just in case, after using the enn.
All those times, I tried using the sigils in the way described here: https://www.becomealivinggod.com/newsletter/how-to-start-using-spirit-sigils-to-get-anything-you-want.html
All of those attempts failed, so should I keep trying different things or simply wait for him to contact me (assuming he knows I attempted to contact him)?
Also, it is not a spell (so do it and wait for it to take effect), I am more interested in speaking to him at least once.