If you're relatively young and in a metro area, you probably don't see it. Step out into the suburbs or more rural areas, and growth means that there's a new Dollar Tree and it's hiring.
The problem isn't with the ACA, it's with employers who are willing to save a buck by disadvantaging their employees.
[1]https://www.census.gov/library/stories/2018/09/poverty-rate-...
The reason the poverty rate had a three year drop was because it was at at 10 year high around 15% starting around 2010, and only recently started dropping significantly.
The "50 year low" is very misleading. If you actually look at the graph, the poverty in 1970 was 12.6%, and in 2017 12.3%. That's not a "50 year low", that's 50 years of essentially no progress on the poverty rate, especially when ten years ago it was higher.
If you look at the people falling below 50% of the poverty line (deep poverty), that's had it's ups and downs too, but has had an overall slow increase of rate over the same time frame.
https://poverty.ucdavis.edu/faq/what-current-poverty-rate-un...