Talk to the ones you WANT to leave !
Be friends with them, write them letters, give them gifts, do their requests !
I TTed all of my unwanted villagers this way ! * U *
Basically -TT one day forward, talk to all villagers,
TT one day back, talk to all villagers.
Make sure you aren't carrying any furniture or shirt or stuff other than tools !
I recommend you don't carry bells, either * U *
Between these two time skips, someone will definitely want to move out,
and as long as you talk to your unwanted villagers as much as your dreamies, they'll ask to move out as well ~
Hope this helps !