If you aren't ready to invest in the plugin yet, here is how you can get the Deep Glow look for free. 1. The "Stacking" Method (The Best Manual Workaround)

Many creators have released free FFX preset files that automate the "stacking method" mentioned above with a single slider. 3. Using 32-Bit Linear Workspace

Deep Glow works by stacking multiple blurs at different scales. You can replicate this manually without any plugins: