You have a lot of reading assignments to do if you're just about to start.
First about experience, usually (but not necessarily always), you fare a better chance by means of getting a higher EOI score if your degree and work experience are consistent. Then, your work experience must also be consistent for all your claimed years. Were you a ship design drafter/staff from the start until now? If yes, that's good, if not, you have to choose which career you are most invested in, then the other years which have significantly different role will not be considered. As far as I know, they don't consider "ship design staff" and draftsperson as the same. But you can try maybe to get assessed for an NEC type occupation, you have to justify this depending on the assessing authority.
After that you need to consider what types of visas are applicable to your nominated occupation. Then territories where they are eligible. TLDR: Ship Drafter, Draftperson, and NEC variations may not have the same eligibility.
To address your other questions, personally if your chances are slim, study is a good option provided that you can actually afford it and the program is actually lucrative. Tuition fees for foreign students are astronomical. This is an investment and has a high risk with regard to what you intend to get which is migration or Australian employment. This is not a guaranteed pathway to migration. If it's just about "learning", then by all means go for it and it's not going to be wasted - as if this is what most Filipinos are after. Also, you are most certainly will not be allowed to work full time "while studying" so there's no such thing as "employer sponsorship while studying". Student visa holders are allowed to work but with a number of limitations.
Job titles don't matter much if you're not applying for upper management roles, they look for the details of your roles - that is more important. But this is for the assessment stage. For employment if you already landed in OZ, it may have weight.
