Lot of trial and error and reading up on ingredients. Doing things like googling every ingredient on the package, then working and remembering what works for me and what doesn’t.
Agree with Stumped that’s it’s unlikely you’ll find one range you’ll buy from exclusively. It is possible though to find ranges you get a few things from, and who might be your first port of call for something new.
For example:
Evolue- I buy their hydrating serum and gentle cleanser as staples. Also quite like their eye cream when I can get it (from the US as it’s stocked here). They are cruelty free, fragrance free, keep everything very simple and it really works for me.
Garden of Wisdom- really like their salicylic and azelaic acids, so I’ve got a bottle of their glycolic acid to try as well as some of their retinoids.
BloomTown- they do really nice clay masks, made with glycerine so they don’t dry out and crack. Really liked the charcoal one, so I got some of the blue clay one to try and it’s fab too.
Chantecaille- love their mascara, gel blush and illuminator, so I keep an eye on their seasonal highlighters/eye shadows and buy one every now and again. Great colours and formulations mean you only ever need a tiny bit
Ere Perez- love the eye pencils so tried their highlighters and lip tints. Again, great colours and ethos, Quite sophisticated colours and finishes, always glide on.
I got sucked into the trap of finding a hero product and thinking I needed to try everything in the range though. Now, I will try something else from the same line on the basis of something great, but if I don’t like the additional thing I’m unlikely to go much further.
Alpha-H and Glossier are good examples of this. I love Liquid Gold and couldn’t live without Boy Brow. But they really are pretty the only things from those brands that I really rate. Glossier Lipgloss is kinda ok but a bit sticky, the Alpha-H Liquid Gold wipes, body cube, scrub and mask are also good, but not as good as the original.