Merriam-Webster's free online dictionary defines boredom as "the state of being weary and restless from lack of interest." As a child I complained about being bored. Then I discovered reading. The closest I have come to thinking I was bored since was my episode of clinical depression in the early 80s. In reality, that was not lack of interest. It was the inability to feel pleasure in any activity, even those I had always enjoyed. Fortunately, I took imipramine for about 18 months or so, along with therapy, and never has the condition recurred. I do often feel weary, but that's the lupus assaulting me.
Escaping boredom -- the real thing -- is actually very easy. Get interested in something. Now this might not work for people with really low intelligence, I don't know. I do know that even people with intelligence levels below "functional" can find things to be interested in. My brain damaged cousin surely does. So my suspicion is that the biggest impediment to finding interest is lack of effort. So here are some things to get interested in; pick one or two. It's not an exhaustive list.
Acting. Community theatre is a great outlet
Animals. Adopt,. foster, volunteer at a sheter.
Art -- doing or studying its history. Youy don't have to be good at it. IF you enjoy it, DO IT!
Birds -- watching them, learning their calls, volunteer for the annual bird count.
Children. Tutor, teach them something you know
Elderly. Volunteer in a nursing home. record their stories of the world when they were young.
L:anguages. Try out a few on the free sites.
Reading. About ANYTHING.
Sports. If you can't play, coach, volunteer to drive the team, anything.
Travel. If you can't afford the real thing, do armchair travelling with books and films