I do not use Reddit much at all, these days, because I lost many subreddits that have been banned by them for the promotion and now I only have some small ones to post some of my sites and I do not care about losing them at some point.

I do not really do this. However, my sites are quite simple, I have the basic but user friendly design which loads fast which is an important factor for the SEO and then I make sure to add good content and later on get some backlinks, but you might not need lots of them if your niche is small.

Honestly, I can only tell you that it works quite well with the XVideos and it removes their ads from the embed videos but I am not sure about other tubes. You need to be aware, that you might very little help if any from the XWPThemes after the purchase, but it is the same case for other adult theme shops, sadly.

You need to reduce the number of the ads, especially down the page, in the footer area, because it does not look good aesthetically and also from my experience, more banners do not necessarily mean more money, because users usually click on one or two ads and if they see ten ads in a row, they most likely do not click on any. Just keep working on it, adding some original content here and there and results will come in the future. If you have some small successes, then it is good, but do not stop putting time into it.

If you want your main site benefits from the SEO of the blog, then you need to have the blog on the subfolder like myadultsite.com/blog and the one on the subdomain is treated like a completely new site by search engines so keep that in mind.