It can be really hard to find a job in your field, and I imagine it must be hard in such a specialty field like Marine Biology. Have you had jobs in the field before? If so, did you end up leaving those by choice or for other reasons?
There’s the saying “It’s always easier to get a job when you have a job.” I’ve found this true for me in the past. I’ll take a job I don’t want or that’s not related to my field or skills, but then I’ll still look for something that I do want. Sometimes the act of working and staying engaged helps keep the motivation going, and also helps remind us of what we really want or don’t want. Sometimes too it can be that we’re not looking for what we really want or need. I think Dr. Hallowell says it well when he says that part of ADHD success is finding the right job and the right partner. Find something that you your’e good at, that you like doing, and that someone will pay you for.
What are you good at? What do you like doing? Why do you like doing it? What can you tolerate doing forever? What can’t you tolerate? Maybe there are skills you already have from your field or your career that can be parlayed into another position. I know lots of people with degrees like social work who end up working in corporate jobs, administration, or other fields. Sometimes the skills are much more important than the title or the business card.
Mostly, try not to lose hope. Job searching is the absolute worst. It can break you down in terrible ways. Just know that it takes time, and try to believe when people say “the right thing will happen.” It takes a while for the stars to align sometimes, but they definitely can. I’ll be hoping for you! Good luck!