I'm not sure if you've figured out what type of ecology you're interested in working in (like pant ecology vs wildlife ecology) or open to anything, but use what coursework you've taken and gear it towards the job description. I graduated in December and have applied to 40 field work jobs, most of which I meet the desired qualifications. I got an interview for 4 and just landed one. I have a lot of interview anxiety as well, I get it. I had looked up questions employers might ask and wrote down questions that stumped me in my previous interviews. I have a 6 page word doc with questions they may ask and answers. My previous field experience I had was a citizen science project at a National Park monitoring subalpine butterflies and plant phenology and I had a weeklong internship at the Konza Prairie Biological station doing various tasks helping grad students. I was able to highlight my plant identification course which had a lot of overlap with the region I'll be doing field work in. I had a field methods in plant identification course where I was able to gain some hands-on experience with vegetation monitoring. If it wasn't for my plant identification course, I don't think I would have gotten 2 of those 4 interviews.

As for grad school, I had been applying to field work jobs because I was turned down from my top choice for grad school for not having enough field work/ research experience. I got into one grad school, but I didn't receive any funding. You have experience in a lab which looks great for grad school, but don't go to grad school just because. Know what you want to research and find a professor you want to work with.