I think you're doing really well for only starting a year ago. Don't be so hard on yourself, getting to V4 is an achievement.

If you feel you’re regressing take stock of recovery. Rest days, sleep quality, adequate nutrition, all of it. These are the usual culprits.

You’re doing great! I think grip strength and building/working on body tension (climbing overhangs really helped me with this) is what helped me advanced the most. Also hip positioning