I would probably send my resume over to recruiters and started looking at possible new opportunity while keeping your job. It won't hurt to get a sense about t

I would probably send my resume over to recruiters and started looking at possible new opportunity while keeping your job. It won't hurt to get a sense about the current job market, what interesting companies are hiring and what are salaries for positions with your level of experience. You will find out whether you are underpaid or not (working for a startup you very likely are) and then decide based on that.