I'm not sure I understand why you would even consider quitting at this point. It would be different if you weren't profitable, then perhaps you can look at opportunity cost because it might be just continued losses, so the sooner you get out, the less money you would lose. But since you're profitable now, it should be up hill all the way, unless of course you aren't that confident.
I see you put numbers to your situation. If lets say you lost 100k, and you figure you can make about 75k or more, then this would roughly work with your figure of needing 1-1.5 years to make it back. The question for me would be can I keep doing what I'm doing and live the life I want to live. If this allows you to quit your job and just there, the answer is easy. If you still have to work, while making money to trade, and this is causing you to be over worked, then I can see why doing this another 1-1.5 years would be hard. But in this case, you certainly haven't found the holy grail because its just a side gig.
Like you say, you can always leverage up, and this is what makes trading such a damn good endevour. If you can make 50k per year consistently, hitting 100k shouldn't be that difficult, at least technically.
I really wonder what part of you makes you want to stop even if you are finally making money. I would bet that the type of trading you're doing isn't easy on you, is time consuming, is time intensive when you consider your other obligations, and if this is all true, then I would think you haven't quite gotten your stride yet.
As a side note, most people need way more than 1-1.5 years to recover losses from other failed ventures.
