First off use TOR browser to login here so your ISP doesnt know that you visit this site. There are many ways to make your death look like an accident.
You can look up the 'shallow water blackout method' on the search-bar to learn about making yourself drown painlessly, just to let you know that for shallow water blackout you have to be swimming in a large body of water, putting your head in a bucket of water wont work.
You can try and do the carbon monoxide method in a tent and pretend you were camping
You can look at RC drugs and take them together, etizolam + RC opioids are very deadly and also legal depending on where you live.
If you dont care about committing a crime. You could overdose on GHB, it's a drug used for nefarious purposes but people also use it to bring pleasure to themselves, if you take a bunch of xanax and drink alcohol that is laced with 10 or more grams of GHB it will kill you, it kills the same way as N so it's painless. If you die via GHB overdose the police would most likely suspect you werent planning on killing yourself but instead wanted to get high but the initial dosage wasnt high enough
The only problem is availability, price and the fact it is illegal if you're caught with it. There's this thing called "the darknet bible" which is a guide to buying drugs like GHB from the darknet, if you follow the guide the chances of being scammed or hacked or arrested is very slim.