I always had great success with singing songs or chanting.
I have a very pleasant singing voice and it has always
appealed to young children. I made up songs for just about
every situation possible to gain attention from the
children. I suspect that since you are used to teaching
much older students that you might have a tendency to talk
too much. Is that possible? Children become 'deaf" to those
adults who tend to talk a lot with plenty of requests or
"instruction". This age group is very hands on and want to
be doing -- not always listening. Keep large group
instruction to a minimum and use music as much as possible.
As you start gaining their respect and attention you can
gradually add on to the minutes of actually instructing.
One of my own children had a K teacher who used to teach
third grade for several years, and she wanted to just teach
half days so she could be home with her own children. There
was a huge difference between how she related to the
children then all of the other early childhood and K
teachers I have worked with or my children and
grandchildren have had. I am sure she eventually made the
adjustments to be more successful with this age group, but
that year, she had some of the same response from her
students Kindergarten aged children are in a different
developmental stage then older children and they do not
start going into abstract learning until closer to age 6.
There have been several experienced K posters here, so I am
sure you will get some excellent advice. Don't give up -
continue searching and asking to find those tips that can
make you the best you can be with this age group.