Anxiety, stress, and modern blueish, bright lighting/screens are a huge part of the problem. Humans didn’t evolve to deal with overstimulation in the evening.
I had insomnia and stress issues for years to the point I had a panic attack – I thought I was having a heart attack or stroke. Dealing with the stress and light were major steps towards resolving the problem.
I cut way back on the news and doomscrolling to no more than an hour a day before noon. I set my house lights to dim down with the sun, and no TV, phone, or computer screens for at least an hour before bed. If it’s unavoidable: dimming them and a blue light filter help.