A proxy alone doesn't guarantee you won't get blocked — it's one piece of a larger pattern that anti-bot systems evaluate.
Slow down and randomize timing
Requests fired in a perfectly even rhythm look automated even from a clean IP. Adding random delays between requests, closer to how a human actually browses, reduces one of the easiest detection signals.
Rotate IPs and user agents together
Changing your IP but keeping an identical browser fingerprint every time still creates a recognizable pattern. Rotating user-agent strings and other request headers alongside your proxy makes the traffic look more like a genuinely diverse set of visitors.
Respect obvious limits
Checking a site's robots.txt and any published rate limits, and not hammering the same endpoint far faster than a person would, reduces the chance of tripping a block in the first place rather than just working around one after it happens.
Accept that some sites will still catch you
Sophisticated anti-bot services look at mouse movement, timing entropy, and dozens of other signals beyond IP address. No combination of proxies and headers guarantees you'll never be blocked; it just narrows the odds.