YOU SAID:

I have had a lot on my plate

INTO JAPANESE

私は自分の皿にたくさん持っていました

BACK INTO ENGLISH

I had a lot on my plate

INTO JAPANESE

私の皿にはたくさんありました

BACK INTO ENGLISH

There were many on my plate

INTO JAPANESE

私の皿にはたくさんありました

BACK INTO ENGLISH

There were many on my plate