I've finished projects and earned continual revenue from them. If it isn't compelling, then perhaps it is best to just let it go.
If you already feel proficient with your tools, you can't justify your projects to learn these same tools.
You are not the problem here. The problem is your ideas are not compelling enough for you. Think of something which will compel you to finish. Break the project down into manageable stages and execute. Don't make excuses for yourself. If you want it, you will get it. Otherwise, what are we talking about?
If you already feel proficient with your tools, you can't justify your projects to learn these same tools.
You are not the problem here. The problem is your ideas are not compelling enough for you. Think of something which will compel you to finish. Break the project down into manageable stages and execute. Don't make excuses for yourself. If you want it, you will get it. Otherwise, what are we talking about?