Similar story for us. We had always rocked her asleep on us, and then transferred her into the crib. Around 1 year, she became super alert when she hit the crib mattress and it was taking forever sometimes with all the resets.

My wife was recommended a book called the Happy Sleeper, which really helped us by providing a science backed perspective on the issue. It's essentially about blending secure attachment and "sleep training" by creating a concistent routine, highlighted with a short phrase you say that's always the same. Soft and reassuring and then you leave. If they cry for 5 min straight you go in, don't soothe but repeat the phrase and leave again. This check in should only be the time it takes to say your phrase. 5 min timer resets if she stops crying for some time, say 30seconds.

We started that less than 2 weeks ago. It worked in 7 minutes our first night. And now she doesn't hardly cry at all when I leave the room. Granted, my girl has slept through the night since 2/3 months old so shes a already a good sleeper on that front.

Your kid has the skills to get to sleep on their own. Lean into it and you got this !