The best in my opinion is to get referred by other girls. They all have friends that escort on the side.
I felt too lazy to write yesterday, but yes that is absolutely the best way to go about it. You gotta spend money to spend more money. If you can gain their trust they are more than eager to refer a friend. Downside most of the times initial booking is set up as a duo but then you just collect phone numbers for further meets. Those friends in turn can refer other friends.
Hopefully you get what types of girls you’ll to have book to pull this off, without me explaining to you.
As for private galleries, a lot of the English ones will have UTR girls offered to regulars via WhatsApp, rather than an actual gallery you can log into. It’s all in the level of trust you can gain. A lot of those girls are ephemeral, they come and go like the wind. It’s like not a steady stream of supplies either. Sometimes they’ll offer up 3-4 for girls in a week, then nothing for months on end. Kingslover do it that way, but I’m sure places like ISB and Kingley do it to. UKGG on top of their stale private gallery used to offer some girls this way too. I guess these girls were extra private.
FWIW - someone once showed me the descrete elite and dolls and roses galleries. Wasn’t impressed to be honest. A lot girls already available via other agencies from what I recall. But that was over a year ago.
Good luck.