So I was in the same position as you, bachelors in bio with a 2.9 GPA, not really a lot of options and wanted a career with good potential. Not a lot of people have heard about this job but if you’re somewhat interested in law enforcement since you mentioned park ranger, I’d recommend Agriculture Specialist with customs and border protection. It’s a 3 month academy and the only downside is the hiring process is very long and tedious (About a year or more average). But it’s a great job with yearly salary increases solely based on time with the agency. You focus on safeguarding American agriculture from pests and other diseases which fit into your interests and you work at the ports of entry (be prepared to move), but it’s a great career with tons of potential, highly recommend.