Best Photoshop workflow for Roblox-style gaming thumbnails on mobile?

I’ve been experimenting with Photoshop for creating Roblox-style gaming thumbnails and profile graphics, especially for mobile viewers on YouTube and Discord.

One issue I keep running into is that some text effects and character outlines look sharp on desktop but become blurry or overcrowded on smaller screens.

I’m also testing different username styles and invisible spacing characters for cleaner gamer tags, but compatibility seems inconsistent across platforms.

For creators working on gaming thumbnails or Roblox-related graphics:

• What canvas size works best?
• Do you sharpen before or after resizing?
• Are there recommended export settings for mobile clarity?
• How do you preview username formatting across platforms?

Would appreciate any workflow tips from people designing gaming content in Photoshop