Hi. I've not yet found a job, but my friend has had two since she turned 16 (she's now 18), so I'll share what she told me.
Her first job, she walked into places and asked if they were hiring. I think she went into about 6 or 7 places before she found one that was. After having her first job, she found it much easier to get a second.
And whilst I've not found a job, I did successfully do volunteering during the summer. For this, I emailed a couple of charities nearby and asked if they were open to me volunteering during the summer holiday.
Having volunteering or work experience/a previous job is supposed to help, so if you're struggling loads with finding a job, maybe try to find a short stint of volunteering and/or work experience (which could be virtual) first.
Hope this helps 😊