Not really a "cajun " seasoning.
My for sure cajun south Louisiana
ex boss turned me on to Cavender's
Greek seasoning long ago, and it
works well in Louisiana dishes, cajun
type and creole both.

FWIW there's bunches of spice blend
recipes online. Some of them are
great, and some are crap.
You just have to try them and see.
I have put together some I didn't care
for at all. One I found was for a "cowboy '
spice blend that sells for about 10 dollars
online. I did put it together and it was
really good and tasted like the store
bought item. But it had over a dozen
ingredients and wasn't economical to
try to duplicate unless you were making a
large quantity of it. So there is that
issue to deal with too
Some are really simple and economical
and you can save some money.
Garlic powder and onion powder and
plain black pepper is one and it's good