a bit shy to ask but …. do you suggest posting about my au on my main blog or a separate blog for it ? asking ‘cause it’s been some months I’ve been thinking about it

I want to be clear, this is only my subjective opinion on the matter, but I do think it doesn't really matter. On my side of things I found juggling multiple blogs a real pain in the rear. All that matters is that you do something for you. What would be more fun for you ? What would make YOU happy? Because in the end, that's why you're on there right ? To have fun and enjoy yourself.