I think you need to look for specialized graphic design portals. I know that there are many different directions in design, so I cann't recommend you something specific, but I, for example, work as a graphic designer of printing products and very often I have very typical orders for design, work onwhich used to take too long. Now I use free resources from this portal https://www.ls.graphics/free-mockups such as mockups. It really helps me to avoid sizing my designs and the first layer in these mockups for printing is usually the most time consuming, so I was happy to get rid of the need to outline the product over and over again every time.