Most people who quit digital illustration in the first six months quit somewhere between month two and month three. That is when the gap between what you can imagine and what you can actually draw feels the widest. I know because I almost did the same thing.
The first three months were mostly frustration
I started with Procreate on an iPad in January. By February I had fourteen half-finished pieces and zero I was willing to show anyone. The problem was not the software. It was that I kept switching brushes every time a piece looked wrong, assuming the tool was the issue.
Month four was when something shifted
I picked one brush, a basic round with slight pressure sensitivity, and used it for thirty days straight. Suddenly the inconsistency in my lines became obviously about my hand, not the brush. That single constraint taught me more than any tutorial had.
By month eight I had a small body of work
Nothing portfolio-worthy by professional standards, but coherent enough that I could see my own style forming. The pieces from month one looked like a different person made them.
Gardening and Landscape Design taught me a similar patience. You plant something, you wait, you adjust conditions. Digital illustration works the same way. Progress is slow and then suddenly visible.
If you have already tried and stopped, the timeline above is not unusual. Most people restart two or three times before anything sticks.