That’s the 9 month sleep regression. Following bc they are killing me as well. For my LO when I notice a regression I give her plenty of stimulation and time to physically get tired. That usually does the trick But even so the extra nap and late bedtime tends to help.
My daughter is 16 months now and I ALWAYS lean toward late nap/extra nap and late bedtime. It just seems to work better for her. If she goes to bed too early, she ends up with a split night or she sleeps 30 minutes and treats it as a short nap. So I definitely vote short nap (30ish minutes) and later bed time! I’m no expert by any means but that has always worked better for us!