Looking for practical day-trading advice: tools, intraday moves, and order sizes. NCLH mostly.

I’ve traded NCLH profitably for a few years by buying dips and holding for swings (cash account, no shorting or margin). Recently I’ve started trying same-day trades to stay more active. Results have been mixed so far, but I’ve decided to focus almost entirely on NCLH since I already know its longer-term levels well.
I’d really appreciate input from experienced intraday traders on three specific points:

Charting tools:
I’m currently just using the default charts in the Charles Schwab mobile app. They feel pretty limited for intraday work (small time-frame candles, not much volume profile info, etc.). What platform or setup do most of you use for clearer Level 2, time-and-sales, volume profile, or just better 1-min/5-min charts? Free or low-cost options preferred.

Understanding Friday’s move (Nov 22):
NCLH opened around $17.50-ish and initially drifted lower as I expected. Then roughly two hours into the session it ran straight up to about $18.25 (+4.3 % intraday) with no obvious news that I could find. Can someone who watched the tape that day explain what drove that move? Was it a specific catalyst I missed, short squeeze, large buyer stepping in, unusual options flow, or just normal momentum once a level broke? Trying to learn how to read these sudden intraday legs.

Order sizes I’m seeing vs my own:
When I watch the bid/ask, most prints are 100–400 shares at a time. When I enter or exit, I’m typically using 5,000–8,000 share lots (market orders that fill instantly). Liquidity has never been an issue, but I’m curious why the majority of visible orders are so much smaller. Is it mostly retail scalpers, algos splitting orders, or something else?

Any insight on the above would be very helpful as I work on getting consistent with intraday trading. Thanks in advance for anyone willing to share their thoughts.