I’m seriously considering focusing only on QQQ. I trade options and I’ve done really well with QQQ. Not so great with SPY for whatever reason. This would be really focused for me instead of being all over the place with all the different stocks that I identify on a daily basis. Is anybody doing this? What have you experienced?
(I'm assuming that you're struggling with focus on intraday trading, because on swing trades with options you should not be all over the place due to lack of focus)
SPY and QQQ are very highly correlated, and if one can trade the QQQ, then one should also be able to trade the SPY without any issues. I suspect that your success with QQQ had to do more with a streak of luck. (Only you know your stats.)
Yes, being focused on one instrument helps, but at the expense of very limited number quality setups. There simply are not that many good quality intraday set-ups in one instrument.
In your case I’m afraid that there are possibly other variables that will need to addressed otherwise you might end up transferring your weaknesses from one instrument to another.
A good intraday price action trader can trade M1 TFs on four instruments. (four charts of M1 charts for timing the entries on one monitor, and four charts with higher TFs on another monitor for reading the PA context and setups). Otherwise intraday trading becomes inefficient and stressful waste of time.
Pre-market preparation is the key. You need to draw your levels of interest (where to expect sellers/buyers) while the market is closed, and then you just update it during the day. Then you just wait if you’ll get set-up around those levels.
There is no need to be glued to the monitor as an intraday trader, you just place alerts around your levels and then go and do something else (washing your car, or gardening, or whatever), and just come back to your monitors say every 30mins or when your alerts go off.
Apart from preparation, you must know exactly what setup you'll need to see on the higher TF so you can get the direction right, plus you need to know exactly what you need to on your lower TF to get your discounted entry, tight SL and your timing right.
If you are timing entries on M5 TFs and are reading the PA context say on the M15 TFs, then intraday trading up to six instruments is manageable. Anything more than that becomes a problem because it becomes difficult to remember the detailed PA on more than six instrument. (It’s because or memories can hold on average around seven chunks of information.)
Once you see a setup developing, you just close all the chart with the other instruments to prevent any distractions so you can plan your trade calmly before you get the timing trigger on the M1 or M5 (or whatever). Since you'll have your charts thoroughly marked up, you’ll know in advance where your targets will be and if there will be enough space for reasonable R/R. This way the trade planning should not take too long (you just go through your checklists).
The only time I’d suggest focusing on one instrument only, say SPX, is if you’d be monitoring intraday he changing market dynamics, and marrying that together with your PA trading.
PS: Take @Scataphagos’ comments with a grain of salt, his TA skills are at beginners’ level. He's just an attention seeker.