For cam girls in particular? Basically the strategy in the old days would be to try to get some sort of contact info off-site, which usually meant putting some work in on-site to let them know you're not a creep (often this was a long game that involved spending money online, but then I hooked it up with a lot of cam girls without paying for that part). Eventually you'd get their Skype (old times), then it switched to WhatsApp and nowadays you may find some use Telegram instead.
However, nowadays the process is usually easier and faster to open up the discussion because a lot will have real social media presence, like a Twitter or Insta, so you can usually just Google and find a way to talk to them.
On top of that, it's easier to get a yes because being paid to fuck has been very normalised by the Instagram generation. Lots of cam girls back then would be all "no I would never do that! ...but we can just meet and hang out" and you'd end up fucking for free (but basically paying for food, accommodation, etc.). Nowadays the stigma isn't there for them.
There's also sets of cam girls that have access to each other. Whether they've worked out of the same studio like was normal back in the day, or whether they've just done shared streams, paying attention to that can help you find an in-road too.
Almost all the cam girls I have fucked don't typically do regular escorting, but I love cam girls and it's kind of my thing to try and get them. I much prefer them to porn stars or standard escorts. I have the disposable income and I love the idea of them crossing the line where they haven't before, especially if I've built up a fantasy of them having watched them online.
For PMW, we talked, she gave me her Telegram and we flirted and talked for some time (I would feel weird about our talks if I were her BF), and then I suggested we meet up. She was super hesitant, but we'd video called and shit, so she knew I was who i said i was... and... $$$$ talks. Her deal was pretty much she did camming, but her BF also gave her money on the side because she generally didn't bring in any crazy amounts on her own. So here was a big chunk. We met up, I was there for multiple days, and she'd sneak off to meet me and we'd hang out, go to coffee places or restaurants, and fuck at the Airbnb I'd rented.
Met up again later and she was no longer in normal-girl-i-was-paying mode, but had just jumped into the sex toy role. She'd gone full bimbo look and she was just amazing. The glow up was unreal, shes was like a dream girl with better hair, fitter body, the fake tits. One of the hottest faces you could ever dream of seeing sucking your dick.
Eventually some time later I'd offered her to come do a group setting with 6 guys and 2 more girls, and she was down. And when we'd meet up on our own, she'd always just be becoming more and more into it, even suggesting her own ideas. We fucked in a car that must have been 50 years old in a public park once.
For cam girls, you just need to figure out their situation and you'll find an in road. From there, if they already fuck for money, it's easier. If not, you will need to invest time to build trust and find out the right way to make it happen.
It's a good chase, but it's basically my side hobby. In the office I've always got cam sites running scouting for girls, as well as a bunch of girls I'm talking to at any given time.
If I had to give up escorts, porn stars, or cam girls, I'm keeping the cam girls. Perfect mix of amateur, slut, and porn star, and many times you could be the only one fucking them outside of their relationship.