Retirement tax questions

I should just go to a tax expert and let THEM do my taxes! I kept getting this deferral message and finally, since I was so close to the end, just ignored it and filed my taxes. My biggest problem now is why I'm only getting a $600 stimulus when I make less than 30K a year,, have an AGI of $17,986 (!) and have been living on the edge of existance since I began collecting S.S. 9 years ago. None of this makes any sense. No one could have a simpler tax profile than ME!