If you're building with KiCad then I've found the folks on the KiCad discord[1] very willing to take a look over a design and provide feedback. There's also a subreddit[2] for PCB design posting and review, but I haven't personally used it.

[1] https://www.kicad.org/community/chat/ [2] https://www.reddit.com/r/PrintedCircuitBoard/