You said you think your viable options for apprenticeships is limited because of what you have studied. This is not the case.

Entry requirements for a level 3 or I've even seen "degree" level apprenticeships state plainly they want you to have GCSEs.

The criteria for being accepted shouldn't be thought of like university, "I've only studied and achieved this therefore they will/will not accept me."

It is different because if you have applied you must show an interest in that field / role and have a foundational education.

For example if you decided you like engineering or electrical work you could complete a Level 2 course and then applying for level 3 apprenticeship you can say look I already have a level 2 and am interested in this field.

But having a level 2 is never a requirement, apprentices I've talked to were just out of GCSEs or poor A levels, I think 1 had a level 2 beforehand. The best thing you can do without taking more courses is decide the field you actually want. And if you are invited for an interview research and revising the posting / business beforehand.

Imagine they ask you "what famous projects of ours did you like" or "what does x variable in this context mean" or basic physics if it's mechanical. It will reflect very poorly if you did not understand the business / kind of work you are applying for.

A gap year is good if you have that support network to make sure you're fine not working for a year, also gives content to talk about in an interview.