Changing careers at 4 years into a job, is it realistic? - any advice?

After 4 years as a marketing coordinator I am thinking about moving into a different field. I worked as a marketing coordinator before this. I have a little time and a small budget for training. Has anyone made a similar move?

I began with informational chats, then a short online course, then a related entry-level role. It took about 10 months.