https://graphicmama.com/blog/graphic-design-trends-2021/

Rutgers University

Interestingly enough, colorless design could actually stand out and catch others'  attention amongst the many vibrant and vivid colored designs in 2021. 

Colorless UI Design

Although 3D design isn't new, it has been advancing and becoming more hyper-real and lifelike. Many designers are playing around with combining their 3D illustrations with flat illustrations or adding animation and movement.

3D Illustrations

A very unique and abstract geometric design technique is widely used and becoming the trend in 2021. It is minimalistic but still manages to leave a strong impression.

Bauhaus Style

The following article offers free (some paid) downloads for 3D illustrations. https://graphicmama.com/blog/isometric-and-3d-illustrations/

Free Isometric and 3D Illustrations

Behance is a great platform to view desgners' projects. Here are some amazing 3D Illustrations by Adobe Users. Many use tools such as Adobe Photoshop, Adobe Illustrator, and Maxon Cinema 3D.
https://www.behance.net/search/projects/?search=3D%20illustration&sort=recommended&time=month

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