Passive Income Mastermind

Given the details you've provided, here are three suggestions for establishing additional streams of passive income:
Start a Tech Blog or Vlog: Given your expertise as a software engineer and interest in blogging, consider creating a blog or vlog around tech topics you're passionate about. Once you've built up a good amount of traffic, you can monetize through various methods like advertising, sponsored posts, or affiliate marketing. You can dedicate a few hours every week for content creation and promotion.
Invest in Real Estate Crowdfunding: Since you already have experience with real estate and a willingness to invest money, consider real estate crowdfunding platforms. These allow you to invest your money in a variety of real estate projects with potentially attractive returns. Your risk is shared with other investors, and since these are managed investments, they require less time commitment.
Create an Online Course or eBook: As a software engineer, you can share your valuable knowledge by creating an online course or writing an eBook about a specific aspect of software engineering. Platforms like Udemy, Coursera or Amazon Kindle can be used to host and sell your content to a worldwide audience. After the initial time investment in creating the course or eBook, this can generate a steady stream of passive income.
Please note that while these strategies are designed based on your stated preferences and constraints, all forms of income generation involve some risk and no returns are guaranteed. It's recommended to do your own research and consider seeking advice from financial advisors before committing to any major investments or initiatives.