How can I choke safer using rope?

Hello Everyone this is my first time posting so am really bad at expressing myself sorry.

I've been into choking while touching myself for quite a while, I've started off using my hands but one day i wanted stronger sensation so I went my storage room and found some brown rope and It was perfect with enough power?

Recently (not really Recently but quite some time idk how many days) I've been getting random dizziness but thought it was normal, I'm somebody that does not do research at all, so today I did and somehow found out that it was actually the choking cause? and also the red dot around my face area (i forgotten the name something starts with p) which i thought was acne somehow but was not. There is more things but I think is due to lack of sleep.

So I need help is there some sort of safer way or alternatives to choke so the 2 things won't happen like dizziness and the acne thingy.