Have you tried the Curly Girl method? Have a Google if not. In brief, what I do (having moved to it years back), is I’m silicon and sulphate free for shampoos and conditioners.
A good way to start is a silicone free shampoo to clear out any product you have without leaving something on (basically, silicones usually keep your hair frizz less, but you need sulphates to remove them, which you find in most soaps, and that can be very drying especially for curly hair). When I did this first (8 years ago!), one of the Aussie Miracle shampoos was recommended as being a good sulphate shampoo free from silicones.
Then, you start using shampoo and conditioner that is free from silicone and sulphate. These days it’s often indicated on the front to appeal to people wanting to avoid them, but if you look on the back pretty much all sulphates are listed as ‘sulphate/sulfate’, and silicones are words ending in ‘-cone, -conol, -xanol’ and a few other similar suffixes (you can find a list online). The most common ones are sodium lauryl/laureth sulfate and dimethicone.
I use Charles Worthington Everyday Micellar shampoo and conditioner this one, I find it doesn’t weigh my hair down so my hair feels natural but it’s also well controlled for frizz (in large part due to being sulphate free).
For styling, Boots own curl creme (the pink one) and hair gel (the purple one) are free from these ingredients and work well for me, I just use a little to tame strays.
FWIW I used to use serums, creams, mousse, hair sprays, oils, the works, so I was surprised by how well this system works. Not pricey - £5.99/shampoo or conditioner, always on 3 for 2 in Boots, and the Boots own styling is around £1-2 per tub.