Restarting life at 30?

I'm looking for advice on finding direction in life after stagnating for awhile. Right now I am depressed from feeling stuck in life. Single, same job I hate going to each morning, and I feel like my life has no purpose other then working and watching my shows. My life needs a change and so far I am taking basic steps with eating better, working out, and socalizing more. However, when it comes to bigger changes I need, like changing jobs, I am completely lost on what next steps I need to take. I need to leave my job soon as it has started to affect my health. However, that fear of being jobless or returning to another repetative job I hate makes me think twice about quitting without direction. I can't continue the way I am living as I'm just feeling soul crushing emptiness. Anybody who has made drastic changes to there lives want to share any advice to help with finding the next step?