How to change from 3 fe cluster to 1 fe cluster

[abbracadabra]

originally i set up 3 fe service, 1 master 2 followers, now i want only one fe, and i want to deploy this only fe on a new node, steps i take:

1. deploy new fe node, and add it to follower list
2. then i drop all follower nodes except the new node, this leaves only 2 fe nodes, one old master fe, one new fe
3. then i killed old master fe, i expected the new node to become new master but it did not

after i killed old master fe, i could not connect to new fe node again, it throws connection refused error