A good way I found to get chitin is farming the scorpions with a axe you get like 120 -140 each

Works as a smithy but you can’t repair things in it

I tamed one before I got a saddle and I waited so long to ride it

If you’re on mobile, sabers are good for harvesting chitin. Go into the south cave (the easiest one) and you’ll come out with thousands of chitin.

Do missions if you’re not the exact level or you can get loot drops you have a 1% of getting it or it just random. Hope it helps

Can also be used as a mobile smithy. Pretty handy, right?

Kill trillobits and you will get a lot of chitin

Kill bugs to get the most chitin

just get a direwolf and go cave exploring or getting the artifact for a soothing balm before you tame an argy

got a crap ton of chitin from a single cave run with luna the direwolf