Since Origin only lets you have up to 100 friends, The Sims 4 doesn’t allow you to follow more than 100 people in The Gallery. Luckily there’s an easy way to follow as much people as you’d like to..
Open The Gallery Website and log in by clicking the Sign In button on the upper right corner using your Origin details.
Now, search for The Gallery creations using the Origin ID that you’d like to follow and select one the creations that the person created.
Below their creation you can find a Follow button with a Llama icon. Click it!
With this you’re able to follow as many people as you want without encountering any errors in The Sims 4’s Gallery. Happy following!