Can anyone tell me if this means someone is trying to get my attention and if so, who is it?

I recently was out of state on business. One day, I was on the patio and looked down and there was a dead bird. The next day I was walking down at the old market and came upon a feather, I picked it up. I then came across
another feather. I did not pick it up. The next day I was standing outside at
break and watched the wind play with a piece of trash for nearly 15-minutes in the same spot in front of me. It was like dancing with the trash and wouldnt blow down the street. It was entertaining but bothersome.

I know all of this has some sort of meaning, I am just unsure what the meaning is. Will you please help me to figure this one out?

Feathers are very symbolic of angels or loved ones who have passed over. It can also be coincidental but... usually not when you have had several sightings, like you have.

Have you lost someone special recently? Feathers are a lovely way for them to get in touch without scaring us. If you haven't, then maybe your angels or guides are trying to tell you something. Do you have to make a decision or is there something you are worried about? Perhaps it is the angels' way of saying "everything is ok, you are doing well, don't worry so much".

My sister passed away two years ago and I am working on her estate now. She has been on my mind a lot lately.
How can I find out what it is she is trying to tell me? Should I be worried?

She is your loved one...there is no fear in her connection.  You knew her personality and this has continued into her next stage...the afterlife.  The less fear you attach to any random sign, the more it will be beneficial to your comfort.  She is saying she is OK and not to worry about her as you get on with your life.

I agree, she just wants you to know she is still around and watching over you.