If you spent two years at drama school, I am surprised they didn't prep you better for this particular situation.
sure every actor dreams of becoming a Hollywood
No, they don't, actually. My 21yo dd who is now about to start her second year of training has dreams of working in rep and/or with a touring company. She is also keen on working with children and possibly with puppets. Friends of hers have all sorts of different plans and dreams. Some are writing plays and taking them to Edinburgh, some are branching out into getting directing experience, two of them (incredibly accomplished) are about to start a theatre company in their homeland where there is plentiful funding and well-trained actors are few and far between. The ones who are serious about acting are all spending huge amounts of time networking and swapping information about what is going on and taking part in anything going, from princess parties to walk-on film parts.
Dd herself knows (not least because this is something they really get to discuss at drama school) that her natural casting would be smaller supporting roles and that anything like the "break" you describe is never going to happen. It's not going to be a disappointment when it doesn't.
It does seem to me as if you have somehow missed out on the bottom tier of the acting network. You talk about not being able to get through to producers, but how closely are you in contact with your own generation/level of success in the acting world? Are you keeping in touch with the people you were at drama school with? Can you feel confident that if someone finds themselves short of a small role that would be your casting type somebody else on the cast, or somebody's girlfriend, will say "oh do contact Ageing, she's really reliable and nice to work with"? Can you swap work and support? (dd gets her headshots done very cheaply by modelling for somebody with ambitions in photography) Does your Instagram page and Facebook give the impression that you are active and doing new things?
Pretty well all the graduating students who wanted them got agents at dd's school this year, which is a rather good result, but of course that doesn't mean they're all going to make it in the industry. And for many of them, making it in the industry will mean living in modest circumstances and filling out the in-between times with extra work.
Is this how you see yourself? If not, maybe time to revisit your options?
P.S. Xenia's advice about the Oxbridge degree is sensible enough, except that not everybody is going to have the grades to get into Oxbridge. For dd, the option of being a well-paid lawyer was never on the cards. It isn't for most of the population, of course.
Also, Footlights is no longer the force it used to be: more actors who make it these days have degrees from RADA or Guildhall. The Footlights generation tend to be well into middle age.