This is more of a personal take, but if you're new and feel like you have to dump the entire backlog of old art before you can properly use the site, I suggest just starting fresh with your recent art or choose your favorites. I'm hearing a lot of mutuals gettin' stressed about having to spend an entire day uploading their portfolio onto a new site. You really don't have to.
Don't get me wrong, having a central organized place for all of your art is very important. And If you want to use this place as your main gallery page, then sure, go for it! But there are other sites like Itaku that do a much better job of archiving your art imo. Having at least one place for your portfolio and one place for general posting has always been my outlook as an indie artist!
That said, if the obligation to transfer all of your Twitter content here is overloading your brain and causing you to neglect your page, then don't. Relax. Reflect on the art that you're most proud of and post that. Otherwise just vibe!
It's all vibes here!
Nothing wrong with having a professional presentation, but not every social platform has to be treated like Linkedin!
Speaking as an art fan, I can tell you that even in the case of my favorite artists who I follow regularly, being reminded of old art is often just as good as seeing new art. Like, I know that piece you made two years ago & spent a lot of time on & maybe even went viral probably feels old and unexciting to YOU, but to ME it's a single good piece of art I might have seen cross my feed two or three times in as many years. It still feels pretty fresh on my end! Treat your archive as a resource, not a millstone around your neck - pepper your favorite old pieces in between posting new stuff and everyone will be more than happy! If you REALLY want to have your full body of work available on demand, you can make a public Mega folder and dump your stuff there for people to peruse.