CODE. and Miniluv still gank freighters on occasion, but it isn’t like it was in the past. Whether that is because the prey got good, or just left highsec (or the game entirely) is open to debate. And given how cheap skill extractors make running alts, the ganking meta has shifted to massively multiboxed fleets so the public ganking fleets of say five years ago aren’t really a thing any more sadly.
You can still bump though if you want, and see if you can get a ransom or tears. And if you do by luck tackle a juicy freighter and batphone the right people who have access to a multiboxing gankfleet or can ping enough F1 monkeys, you should get a cut of the booty if you play your cards right.
CODE. also will still band together in smaller groups to go after miners, typically though only the rare ones that provide interesting killmails. Still, you might find a fleet to join in the minerbumping channel, and you don’t even need to join a CODE. corp.
Otherwise, you could look up one of the groups extorting and inflicting non-consensual interactions on highsec structures. That can produce tears or loot, but usually just involves a boring structure grind. Still, at least it would be done with people to chat to. Or join up with the last highsec merc group, and camp the pipes and hubs looking for clueless fools. The recent war changes though mean there are much less targets but people still do dumb things and get themselves exploded by PIRAT.
Honestly, even though CCP has clamped down on the avenues for highsec content creation, it seems more to me that it is the general decrease in highsec activity in recent years that is making highsec a boring place for the piratical-minded. But longer term, if you really want the tools to play the aggressor in highsec, I suggest you start training up a collection of alpha accounts. Once you get them to 5M SP, you can start SP farming them and take them Omega and have a essentially free multiboxing gank fleet at your disposal. That will open a bunch of doors to interact with carebears that think CONCORD makes them invulnerable.