Making a plan to invest online suggest me path

Hi i hope you all are enjoying weekend but i am working what a disaster weekend is for me. Okay lets come to the point. I have a budget around 600$ to invest online and i am curious to gathering information from this forum to where to invest. Shall i share about my skills with you. I have an around 6 experienced article writer team working with me and i am producing around 20 articles in a day. I have an services on fiverr and i had earned around 2000$ from fiverr yet and more is coming on a pipeline. I just need your suggestion where to invest to earn double or triple. Here is more introduction about my skills. We are four brother and i am the youngest one. I had worked in android apps development but Google banned my account three times and now Google track my IP address and i am not able to register a new account with Google developer.

My elder bros is working on ecommerce website right now and i am making a plan to invest in this but my bros advice me to not for this.

I can develop android apps with the online platform like settle cloud. I have two android apps software. I can develop pictures galley apps and book apps. I have a services of article writing on fiverr and i earned around 5000$ in just 3 month. I am making a plan to invest online but before start this i need expert advice from you all entrepreneur. Your help greatly appreciating by me.