Lending is one way to increase your source of profit, it takes a lot of capital before you'd start earning a decent amount. You can check the forum's lending section to get an idea of the situation. It's not the best option but it's better to have alternatives than sticking to one or two options.

If you want to step in the gambling world and at the same time take the smallest risk possible then i'd suggest investing in a casino's bankroll and join with the casino owners. Similar to lending you also need a lot of budget if you want a bigger profit since the distribution is based on the amount you're investing.