How do you stay focused on one business when you keep getting new ideas?

I keep an "idea parking lot" in the note app on my phone. Every new idea goes there instead of becoming a new project. The funny part is that when I look back a month later, sometimes I have no idea what I meant. Between autocorrect and my own shorthand, I end up wondering who wrote the note and what they were trying to tell me. If an idea still makes sense after some time has passed and supports my main goal, then I know it's worth a closer look.