Hedge the risk incurred by your "mini-venture app fund" with other peoples money. Given your track record with app development, there would certainly be demand

Hedge the risk incurred by your "mini-venture app fund" with other peoples money. Given your track record with app development, there would certainly be demand from third party investors for the expertise you bring to the table. Simply offer investors less preferable terms than those you are able get from the app developers that pitch their ideas to you. Not the easiest approach, but after addressing any regulatory hurdles, lining up investors and getting a system in place, you can focus on investment opportunities and leverage up the capital you are currently earning. Your passive investors will be more likely to part with their money if you have some skin in the game yourself. This will have the added benefit of allowing you to diversify into a wider range of apps with higher monetary barriers to entry.