Also good job finding a freediving community to post this too. Too bad it's so small. Of course you can look at this two ways, either post on more popular communities like ones about the outdoors, and traveling. Or you can work to grow this community, like I did when I found SkateHive back in the day, and work with them to grow this community into something big.
If you do help grow a community, that makes you really stand out from most ppl who's just here to drop a post, and then not interact with others. Also

Also when I said post once a day, that was just for in SkateHive. If you post one skate video, then the same day post a diving video in a different community, no one will consider that spamming.
Another great community to join, which can help you learn more about Hive, is the PH community.
https://peakd.com/c/hive-188409/created