A proxy hides your address. Everything else keeps leaving as it is — and mismatches between «everything else» and the address stand out more than the address ever did.
Time zone and language
The most frequent mismatch. German address, Russian interface language, Moscow time zone, activity following a Moscow working day. Each signal means nothing alone; together they draw a picture.
The easy fix is not to fight it but not to create it: buy addresses for your own region. See proxy geo and numbers.
Device
Model, app version and system version travel with every connection. An account created as a phone and continued as a desktop client of a different version looks wrong regardless of the address — see device fingerprint.
Rhythm
A live person pauses, reads, gets distracted, sleeps. A script does not. Even intervals between actions are more visible than any address, and they are the usual cause of a spam restriction after ten messages.
What you control
All of the above, except the fact that you are behind a proxy at all. That is good news: the set of signals does not line up by itself, it is lined up by hand — once, and then it holds for months.
Neurogram keeps a proxy, a device and a rhythm attached to each account — how that works. Consistency beats cleverness here.
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