Baby carrier question!!???

Ok my son just hit the weight limit to be worn on my back! *yayy🤗🤗*. .....but I can't get the hang of hoisting him back there lol any tips?

Also does it take a bit to get used to? It's not very comfortable maybe I'm just not used to the weight behind me..

and why does the strap go up to my neck?? I'm 5' 4" and pretty petite... I tried tightening all the straps and putting the waist band up to more of my natural waist rather than lower by my hips but it didn't help a whole lot?

Anything I'm doing wrong?

*my 4 year old photo bombing EVERY picture lol*

Thanks!