I wouldn’t put all of it online. I suggest you get real assets with 80% of the amount, $20k. And probably invest 20% online. Just $5k
You could buy small sites, apps develop them a bit and resell. Or resell right away. There used to be a market for them if you add say, $40 per site. As your profit.
You have to be careful about the fees though. So set the right price, if you buy 10 websites/apps per day with your $5000. Which remains, you’ll roughly get 30 - 50 websites.
If you resell half of these, you’ll be able to but at least 40 more.
So in a month you can add 5 websites to your portfolio, from you profit you have made.
And you can set adsense campaigns or aff links on the websites so that they convert on the go. Though, this might be unrealistic due to the fact that, a website that costs $100 might be hard to monetize on it traffic. I have had chances where a $70 domains would have like 6000 monthly views.
Which does hurt much.