FTSE 100 symmetrical triangle?

Still learning to analyse stocks so i would love to read your thoughts but I believe a symmetrical triangle is forming on the UK 100 index.

I will wait for price to drop back to 29.110 before buying this ETF for the best possible entry with expected return of around 13% or if price closes to signal breakout to the upside (although I don't expect this to happen just yet).

I dont claim to be an expert and am currently learning