In all honesty, don't. Seriously, this is bad advice. Nobody is going to visit your website and say "woah, this looks like Attio's website - I'm out!" with, evidently, the exception of a few folks from Attio. The website looks good, you and the other company aren't truly direct competitors so branding conflicts are not much of a concern, and if you both truly just derived your designs from a root common theme then I don't know why this is even being brought up here, unless the other commenters were unaware that their design was derived from a template. There are undoubtedly things significantly more worth spending time on as a very early startup then redesigning your website to appease a few people on HN, who were (assuming the common template bit is true) in the wrong for raising this issue to begin with and and should be updating their comment with this context.

EDIT - apologies, the OP here is not from Attio which was my assumption and would've made the OP's post unnecessary but an understandable reflex to seeing a doppelganger of their own website. If you check the OP's profile to see which company they're _actually_ from you will certainly realize that this entire comment chain should be fully ignored. It's pretty shitty, actually.