Very achievable with consistent posting and good content. Most creators who post 2x per week with strong thumbnails and titles reach 1,000–5,000 in their first year. 10,000 is possible with viral content or a strong niche.
One platform until you reach 1,000–5,000 followers, then repurpose to a second platform. Spreading thin too early slows growth on all platforms.
Engagement rate, watch time, click-through rate, and email subscribers. These indicate audience quality and predict monetisation potential better than raw follower count.