So as far as returning to Christianity after dabbling in the occult , it is very normal to feel odd! Although I never got far for the short time I did dabble after coming back (by coming back I mean more leaving the occult stuff rather then believing again since I had not stopped believing) I felt off, but we are taught Jesus forgives us for everything and and God(in this case I will say Jehovah /YHWH to be respectful) loves all his children and even by doing wrong or atleast what we perceive as wrong, that has not changed.
As far had working with the Infernals as you call them, that can be tricky so I will mention two points of view. My point is I believe it is dangerous (maybe even sinful however I believe sin is part of our nature), however if you don’t follow another God or atleast you follow God and Jesus above all others you are still fine although in a Grey Zone.
BUT from what I have heard from non Christians who have worked with YHWH, it may be different.
I would talk to some other occult people here who have worked with him! I am bit more set on my ways but I think it might be a very okay thing to do all the things you mentioned!
As far as Lucifer… that one is a bit tricky for me atleast. As a Fallen Angel who rebelled against God(again to be respectful Jehovah) following him could be seen as a bit disrespectful at the least. However to contradict that, some people (including myself) follow God in they’re own way and I think if you do that everything will be fine, sometimes he has specials paths for all of us that a single sect may disagree with. And as far as the occult is concerned you may have more info to back up with it being completely normally and fine, would hit up the person I quoted as well as ask around! A lot of history that may be able to help you!
Note: Hope you don’t mind me quoting you Dank!