Not really, once Reddit closed off their API to all but the absolute highest of bidders, it broke a lot of functionality of a lot of smaller apps like this. You might still be able to find something to spruce up the CSS client side somewhere, but a lot of devs abandoned the ecosystem once Reddit, the company, made it clear in no uncertain terms that community support and 3rd party partnerships were unwelcome.

The regular Lemmy style is already basically the same as old reddit. That's one of the reasons I moved to Lemmy; it kept a similar format to the old reddit style that I originally came to Reddit for over a decade ago when Digg decided they wanted to suck. The biggest difference is that it's white and the thumbs are on the left and not the right. But you can use RES (Reddit Enhancement Suite) to customize it. Or at least... I'm pretty sure RES should still work 🤔 It's just a CSS editor thing specific to Reddit; I don't think it used any of their API.

it could be through a stylesheet, an alternative frontend, even just a pointer on how you could style a website into a different style. thanks!

You could download the Lemmy Frontend and rewire the API to point to the reddit API

If you just want to modify a bunch of things client side, you could download the browser extension Stylish