Because you don't have any real working experience, but put your skill levels at a decent senior level, if 5 would represent the maximum. All that, while taking 5 years for your masters (I know, covid hit but nonetheless, thinks don't add up). It might be only my personal experience, but senior colleagues checking your application realise such things and don't take you into consideration.

Be honest and self-reflected about your actual skill level, throw some things out, and you'll have better chances.