Pielord
I took a very similar path to you.
I got all of my FAA certs in FL, then went back to the UK and applied for the greencard through marriage to my US wife (who lived with me in the UK). This process took a year.
We then moved to Boston and I started flying for a regional (American Eagle). The training was very good and it gave me some great flying experience, but dealing with reserve system and the crappy QOL was just not for me, so I lasted for a year and went back into aircraft maintenance down in FL. I really wanted to get back in the air again and after 3 years of putting my name out there to various different jet owners and corporations, I finally got the break I was looking for about 18 months ago. I started with a local company flying a Falcon 200 and have just been typed in a 604. My TT is 1200hrs and I am 41. I also do a bit of PT flying in a King Air 350.
IMO, there is a lot of opportunities out there, especially in FL. You just need to promote yourself and mix with the right people and it will happen for you. Jobs are available, but typically if it is advertised somewhere, then you will have a lot of competition for that position. Aviation communities, i.e. airports, are a close knit group. Everybody knows someone, who knows someone. You get what I mean? It takes time to establish yourself in these communities, but if you make a good name for yourself instructing, eventually you will meet the contact that leads you in the right direction.