If this need to 'experiment' in a
current trend, note that the professionals (and probably the robosellers) were already stung, and the winners in the 'blip' have probably already had the best gains and by this stage you'd be likely to joining the rollercoaster just as it heads back downhill again. (But not likely enough to be able to trust to the non-amateur tips, either. Murphy's Law, etc.)
Especially true if there's illegal price manipulation (some sort of QAnon for the financial markets, sounds like...) or just someone playing with everyone's heads (like some sort of QAnon for the financial markets!) with no personal skin in the game in the first place).
Thought experiment: Choose a random company. Create eight personas in diverse places, especially choosing 'private'/time-limited channels that are hard to pick up later. Casually predict a rise in four, a fall in four. Whatever turns out true, drop out from the mismatched conversations (or use for other trolling purposes) and 'suggest' another result on the remainder (two up, two down). When one turns true, rinse and repeat with the final two channels. By the time you finish, you've got one place where you're officially the Prediction God and most of the rest never realised you were utterly playing it be ear, vis-a-vis your 'incorrect' personae that you carefully didn't make look anything like any of the others, just random peeps. Just think how many 'Q's never survived long enough to influence whole political ideologies
Next..? Well, depends on what you want to do with the high reputation you just mustered. The above was really just the means to some other ultimate end. And surely won't be the only game in town.
(NB. You've probably got to have skill and a bit of luck to do this convincingly, anyway, so anyone who could follow these instructions successfully probably already knows how to do it well/has actually done it. I wouldn't advise you to actually do it based on just reading this summary. Or at all, for obvious reasons.)
That said, I'm sure there's plenty of legit 'live play' share-dealing methods (among an indeterminate number of vanity ones more overbalanced to just help the people who run it). I couldn't tell you which they are, though. In the old days I'd suggest finding a bricks'n'mortar broker you think hasn't anything to hide (suggested by your bank manager, over cocktails?), and not too much comission, but it seems every sixth ad I get served at the moment in one of my network devices is pushing one or other Exchange App, which
could include the current best players, and yet I don't know enough about them to even want to touch them with the proverbial bargepole.
Good luck if you do do something. Sorry I'm not (can't be, perhaps shan't be) actually helpful. ((And ninjaed*2, while writing, anyway.))