Prop firms are not a great option for beginner traders, it is a fallacy to think that way. Prop firms are mostly for  traders who have developed a level of certainty about their trading abilities and are just limited because of lack of capital to trade with. Prop firms can be an option for them. 

Some other ways to raise money are;
You can also get people like close friends and family to directly invest in your trading, and promise them a percentage afterwards. If you can successfully meet up with the percentage that you have promised, they will be willing to invest more from which you will also gain.

If your results from trading is very positive and successful, and you have like a channel on telegram or an account on any social media platform where you can show this results, you can get other newbie traders who are interested in a signal group to join yours from where you charge a fee.

You can tutor anyone willing to pay you a token to teach them what you know about trading.