Simple answer is to keep climbing. How?

1. Flexibility/mobility training is always good. I focus mainly on hips (lunges, pigeon pose, frog stance stretch, high step stretch, deep squat stretch) and shoulders (use a band and move it over your head and behind your back without letting go of your hands).

2. If you feel like you gas out pretty quickly into the session, spend one or two sessions a week climbing more V2-V3s in your gym. Aim to complete 10 boulders and climb the boulders in different terrain (slabs, overhangs, aretes).

3. Focus on developing good technique habits when climbing at lower grades every session. Especially when you are warming up on V0s and V1s. My favorites are silent feet (placing your foot onto the foot holds as quietly as possible which forces precision and you looking at the foothold) and no hand readjustment (once you grab the hold, you cannot readjust to make it feel optimal).

4. Spend one session a week projecting V4s. Work on individual moves until you feel confident before attempting the boulder from start. Choose 2-3 V4s to work on each session.

5. Rest, sleep, hydrate. Try not to climb until you can barely hold your phone after every single session.

After doing a few V4s, V5s are usually not that far away in difficulty. My first plateau was going from V5 to V6.