IIRC, my plan back in my days of skiing the backside alone was don't fall and ski fast enough to come out the other side, and don't hit the tree! Lucky for me I (I fell) had a backup plan, Easy-pull-to-release Tyrolia 490 bindings.
Yeah, don't be dumb (like I was), if the snow is deep, don't get too close to those trees, and don't push your luck when they are in your spill zone; ski with a whistle and a buddy.
Count yourself as incredibly luck. Most tree well deaths are expert and advanced skiers.
A couple things I teach my all mountain kids: play 'marco-polo' with your partner as an audible 'ping' while skiing. If they don't answer, stop. The other one is always stop and check any piece of clothing, ski, etc... that you see near the base of a tree.. and don't jump in too close too quickly when going to look.. of course, let you're partner know.