I’ve been hunting on/off out of trees for 30 years, bowhunting as well. Straps etc around your waist are a proven death trap. If you fall, and your spine doesn’t snap from the fall, you will suffocate without quick help as your body weight pushes up against your diaphragm. A harness keeps you level and distributes your weight evenly across your body, enabling you to hang, upright, for hours on end. I have a friend who has unfortunately proven this as he hung for 4.5 hours before rescue. He wouldve been dead with a strap.
I use Hunters Saftey Systems but there are a host of good ones.
If you have a family, you owe it to them to come home.