Here is a great article on your subject. "The Three Myths About Plane Crashes" Lots of tips.

One of them I developed and have practiced for years: "Third, focus on your action plan during the first three minutes of flight and the last eight minutes. That's when around 80 percent of accidents happen."

Most accidents are at take off and landing. Have your shoes on, coat handy, stuff stowed, not plugged in to anything. Be ready to evacuate. What it means is that a crash at low altitude is survivable. Coming down badly from over 5000 feet and you are not going to walk away anyway.

Above 10K feet, there is nothing you can do in a serious (non hijacking) event, except for decompression, where you have about 15 seconds before blackout to put on on your oxygen mask. No aircraft air conditioning = no heat. At altitude, it will be a cold ten minutes minimum to descend to lower altitudes even in summer. In winter, have coats and blankets handy.

For the really paranoid , wear cotton/wool/leather clothes. Post crash fire is a high probability unless you ran out of gas or land in a river. Yes cotton burns, but a nearby fire can be shielded from your skin by cotton, and it falls away as it burns. Plastic (rayon/polyester/nylon) fabric melts onto your skin and sticks even if it does not get hot enough to burn, and hot melted plastic is not something you want sticking to your skin. It's like a burning fire that does not go out.