It is certainly much harder to be a charedi convert than a modern convert.
The change is more significant. One might have to totally change their appearance to be a charedi convert (Beard Peyos , Dress).
One could certainly be a sincere convert and decide they dont want a beard , Peyos or wear a Bechasha and a streimel.
Also more Charedi communities might encourage the convert to cut off ties to non-jewish relatives (including parents and siblings) where the more modern might not.
The most successful converts I know are the ones who converted with non-jewish family members blessings and still have family ties to them