I know exactly what you mean because I was in the same position until I found a platform that really delivers. The site I use regularly is Dropular and you can check it out at https://dropular.net/ right there. It is a design and creative resource hub that curates high quality assets including mockups, templates, fonts, and UI kits. What I like is that the content feels curated rather than just dumped, so you spend less time sifting through low quality stuff. They also have a solid community aspect where designers share their own work and inspiration, which is great for getting fresh ideas. If you are working on branding, web design, or creative projects, this is definitely worth a look. I have found several resources there that I use regularly in my own projects.