How much of a raise should I ask for / can I get?

I am coming up on my 1 year anniversary at an IoT company here in Los Angeles. I joined on when the company only had around 25 employees and their first round of funding. I joined on as the Senior Mobile Engineer on the team for 120k + an equity stake with an agreement that I would be up for raises every 6 months as I would be the developer spearheading the project and I would be more valuable to them the more I understood their system. I didn't worry about the timeline and didn't press the raise in the first 6 months because 1. we were busy and 2. I wanted to prove my worth and gain some leverage. To say the least, I believe I have the most leverage now. The only developers on my team now are my manager and a couple of contractors. The contractors originally built the system and I have since taken over most of the development. Their contract is up in December, and I will be the only person in the company that knows the system from top to bottom. I have had multiple offers from other Venture backed startups with serious funding for lead roles and Director of Engineerinf positions. I have also spread my time around and developed 2 other projects that have generated a lot of revenue for my company. These projects were not something I was originally hired for, but things that I ended up building. I’m curious what I should ask for. As I stated, I took this role at 120k because I felt the company was going to do well, and because they were smaller at the time with less of a budget, and because i was promised raises every 6 months. Now I feel that since my performance for them has been great and I have leverage on my side I am in an optimal place to ask for a good raise. How much should I reasonably ask for or get away with?