I counsel gerim to avoid the Haredi world as much as possible, because the parochial nature of such communities is prone to racism.
The requirements of the Gemara, Rambam, Shulchan Aruch, etc. on conversion have been done away with, and the Demai standard has been abused beyond belief. And sadly, we know morally the situations such self-proclaimed mumchim on giyur have found themselves in.
A sincere ger should be brought close after being instructed al pi gemara in “miktzat mitzvot kallot ve chamurot.”
If a ger relapses to a state of nonobservance, there is nothing anyone can do legitimately to predict such an occurrence. Such a person doesn’t lose their Jewishness, but is instead treated as a mumar yisrael. The fanciful and unhalakhic opinions I see in some circles never fails to baffle me. A lot of apikorsus passes itself off in a Borsalino nowadays.