I decided to try my hand at day trading and/or something in between that and the buy and hold strategy I'm using for my Roth IRA. I put around $50 in a TD Ameritrade account and around $90 in a Robinhood account to get me started. I thought I would like RH better, but TDA definitely has better automated trading tools. The big draw to RH for me was partial shares in companies with high share prices, but you can only do market orders for them, which means time spent hovering over the buy/sell button to get the desired price. RH also doesn't have conditional orders (at all), which is invaluable for limiting risk while day trading. On TDA, I can set a limit order that triggers an OCA (one cancels another) order to sell if the price rises enough to sell or falls enough for me to decide I was wrong about the price direction. I'm using the 1 percent rule (sell if the position loses 1 percent of my account balance, sell if it gains 2% of my account balance), and the automated trading makes it easy to set up and check on later.
I think I'm going to use TDA for my true day trading and more speculative medium-term trading, and use RH for medium-term trading on companies that I'm sure will make me money if I hold long enough. RH just doesn't have the tools to deal with anything that needs to be babysat.