New investor at age 52

Long story short, I got divorced at the bottom of the market around 2010. So I had lost 55% to the market and she took half of what was left. I finally got stable and now contribute 10% into 401k. I want to start a Roth IRA but had one a long time ago and value went from 2k to $880 dollars. So lost again, and she took half of that. I know asking for help on the internet is a bad idea. People will intentionally lead you astray, but I would like to retire and have some comfortability. Where is the best place to open a Roth and where should I invest that money?