I want to take $5 per day, set it and forget it for like 20 years. Where is the best place to put it?

I've dabbled with trades but I don't have the skills or the time to research that I'd like to. I've got a Roth ira and an Acorn invest account, but I think I could take $5 a day and put it into reoccurring in robinhood but I don't have a great idea of the best place to set and forget for 20 years. Any advice ans reasoning would be great!