When making a card that will have multiple embellishments

I usually look at IG of the companies from which I have products and get ideas on how to use them. Pinterest is also my go to place.

I'm more of a scrappy cardmaker (use mostly scrapbooking supplies) rather than stamps/dies, so I use lots of "premade" ephemera/die cuts, etc. For those types of cards, one of my favorites is Anya Lunchenko. She mostly creates for design teams so she's using max product on each card, but she does a great job at layering elements.

https://www.instagram.com/anya.l.studio

I'm a copy cat. I see a design I like then find stamps and other elements in my stash that will work.

Part of the trick IMO is knowing what size of die cuts etc you find easiest to work with. I struggle mightily with those little Lawn Fawn stamps, or making scenes from lots of little images. I know in principle that you need some kind of grounding lines and a focal point and all that, but I find little stamps impossible to use. The one way I make them work is to have a window or grid die cut background to place them in.

Big die cuts and stamps are much easier for me. I tend to use two or three 2x3"ish die cuts on an A2 card, and then I can add a few smaller bits because most of the space is already established. I have absorbed a lot of basic design principles from watching hours of videos from people like Shimelle and Jennifer McGuire, and people who make cards that look like mine, like Kristie Marcotte and Scrapbena Creations.

I would say copying or imitation is a really good place to start, but also just lots of practice. There are YT tutorials about laying out scenes that might help if you like making scenic cards or using LF type small images.