Side projects are a crapshoot, and as @jakobeggar points out, have way too much lead time to revenue generation. Your most reliable option is probably freelanc

Side projects are a crapshoot, and as @jakobeggar points out, have way too much lead time to revenue generation. Your most reliable option is probably freelance work. It sounds like you can put in about 20 hours per week. If you can get a steady flow of work at $25-50/hr that gets you to $50-100k in two years.