I noticed quite a lot of people tend to believe in conspiracies, because they gain social credits by the other believers and are given a (falsely) feeling belonging to "caring community" - which is true for the ordinary participants among each other's, but not for the ones "driving" the conspiracy. They have some agenda by their own.
I know of a graduated electro-physics student (German diploma of engineering), who studied the mathematics, physics and all the logic.. her diploma thesis was about the thermal properties of silicone in the lithography process.. she did learn how to program an fpga, did etch "own" processors into silicone.. doing all the stuff a hardware coder needs to know.. and.. that girl believes then in the vaccines against COVID are some nanobots and nanochips to control us and so.. wait whaaat?
Yes. She actually knows the limits in chips production. She actually knows the need for an antenna for the nanobots being able to send or receive signals. She actually knows that for certain wavelength one needs a certain length of antenna and that it can't be build that small not to see it with ones bare eye..
it is just impossible with the actual technology. But she still does believe in that. And she also engaged with the whole scene.. doing organization of demonstrations and actively participate in acquiring new people into the scene..
Why? GOD KNOWS WHY. I think it's what other people give her back.. feeling to be important. Feeling to be "loved". Feeling to be part of them and part of something bigger... Having "true" friends who care. (her true friends who she know since 29 years are suddenly not friends anymore, but rather manipulated stupid humans)
So.. take care of you beloved ones. That should be enough. Let them believe what they want, but make sure they know you will never let them fall for their believes. And slowly try to ask critical questions which the believer can't answer without thinking.. That's what may help.
With the girl above, everything is lost. She needs a baby to get off.. something she can care about.. wordle wouldn't help, as she would write a solver in HDL xD