It has occasionally worked for me, I just go and wash up and do a couple of things but not always because sometimes she just doesn’t want to sleep either suddenly hungry again or done a poop or just wants a cuddle, it’s normal at this age to want a cuddle in your arms and I always think maybe she’s got tummy ache or something that is bothering her and doesn’t want to sleep on her own
Let him selfsooth but not cry it out. For me at the same age i put him down and leave go do things, if he cries i go pick him up and help him relax and get sleepy again, once he is calm to go down again i put him and sometimes he says awake quiet and goes to sleep after couple mins, sometimes it takes me to pick him up couple times and put back again, eventually he will sooth himself to sleep