HELP: Adding irregularities to conlangs?

Hello!

Daléian and Ayeri, my only serious conlangs up to now, both suffer of
too much regularity I think. The problem is, how can I add a *sensible*
amount of irregularity to my conlangs to add a little spice? How do
irregularities evolve naturally, anyway?
I think this topic also may be interesting for any Conlanger.
Personally, missing irregularity adds a clinically clean feeling to
conlangs that I don't like. I guess there are many other people who feel
the same.

I'd be grateful for tips & tricks. Thanks,
--Carsten

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