The question is how active so your want to be with this? If you just want to buy something and sit on it and then sell it down the road for a decent amount of profit, you didn't exclude commodities, and while they wouldn't be my first choice of what to invest into (aka don't do this, this is not financial advice), but gold is a very traditional one that has appreciated enough in the past couple of years so as to not be totally ridiculous an investment. Assuming that $35k isn't a large fraction of your portfolio, that is. Diversification is the name of the game, so something not in the stock market that shows some history is enough to consider under the confines of this question.
But seriously, if there were some secret investment vehicle that wasn't so secret so as to actually be a secret, and that wasn't a scam half the time, people would know about it and talk about it as a real option. There's a reason that index funds in the stock market are the default advice for non-professional investors. If you're an active investor and have access to good deals, there are good deals out there, but not if you only have $35k. If you do have access to secret private equity deals, that would be investing into companies, but for the most part, ones that aren't start-ups.
Back to the question of how active you want to be with the money though. If you want to quit your day job and be actively doing something with the money, there's things you can buy and then maybe fix up, and then sell for a small profit. do that enough times and you've made a tiny bit of profit. At that price point, used cars that need work come to mind. How much you'd net isn't going to be all that large, and there's a large investment in tools and of time into it, but there's that. Getting a car and renting it out on Turo/Get around might be viable, or driving for Uber/Lyft but that's not a hands off money generator.