Not all, because that would be a bother, but between accounts where I'm a moderator and those where I'm a normal user, I make sure to change my mindset.
On some accounts, I translate everything I write twice for greater anonymity.
Beware, in some cases uncommon or unique anonymization techniques may make you _easier_ to de-anonymize.
So, for example, if you have unique anonymous accounts for multiple online communities but use an identifiable "anonymization" scheme (and with the right heuristics and AI "magic" this need not be a targeted attack), I can correlate and build a profile on you: Military history enthusiast, knife owner, lives in Maine, Boston U alumni, class of 2001, active hours imply working 9-5, age 39, etc.
Which is probably enough to compare against public records, leaked data, whatever, to pinpoint a single individual.