Hey OP. I don't think you need to retrain per se. Just some tweaking to your CV may cut it.
I worked in IT for 10 years in technical roles, everything from helpdesk at the start, to desktop support engineer and finally I was an Information Security analyst, it was good fun for a while and I loved working in a male-dominated environment. But like you, the industry became unstable, mainly due to companies outsource the IT to India when looking to save money. I also had got bored of IT and wanted to do something more creative. I did better at creative subjects at school and quite frankly, I'd ended up in IT by mistake.
In my last job in IT, I worked for a very large retail organisation in their head office, and decided I wanted to get into Marketing, even though I had no qualifications in Marketing! I'd sorted many IT problems for the Head of Marketing and build up a good relationship with him. One day I asked to meet him in the canteen for coffee, explained I wanted into his department and asked how I could boost my chances / persuade him I could do it. He was unconvinced that I had the skill set and also said I was 'over qualified' for most of his roles. (Huh?) Anyway, getting to the point, a role came up in the photo studio, which officially sat under Marketing, where we took photos for our huge website of products, plus promotionsl leaflets and emails etc. It was an Account Manager role, organising the photo shoots, booking models / stylists / photographers etc. I had all the core skills required, just not experience in the field directly. I ended up proving that the skills I had like, project management, stakeholder liaison, working to deadlines etc and got the job.
After 4 years I'd done all I could, but couldn't get a job anywhere else. As the job was niche I couldn't get a Marketing job elsewhere, employers just saw the 10 years in IT and it outweighed the 4 years in the studio, which they didn't view as an actual Marketing job.
So I tweaked my CV, used buzz words that would get picked up, so in my studio job, I talked about being part of a large MARKETING department, managing extensive CAMPAIGNS, I gave examples of PRODUCT SALES UPLIFT due to DIRECT MARKETING emails that used the photography I had overseen.
Then on my IT section of my CV, I changed the word users for CLIENTS and people who requested projects were STAKEHOLDERS. I also dumbed down the technical parts of my IT career and focused more on the project delivery, meeting deadlines and client liaison.
Sounds crazy, but I had to help the employer make that mental jump.
I then forged relationships with the best recruitment agencies and I started working as a contractor (on a PAYE basis) for them, it was easier for me to get into big name companies for 3-6 month stints, as I met the brief of their short term needs, was available and the agency sold my skills into them. All I had to do, was take my portfolio to interviews showing my previous work.
This strategy worked, I worked for huge names and each job I next went for I was tweak the wording, or skills emphasis of my previous roles to match what I was applying for.
I had one role in a Marketing and Comms department at a college, there I discovered I loved writing and was good at it, so I starting saving examples of my writing (website, prospectuses, intranet, press releases) for my portfolio. When the job was coming to an end, a permanent job at a PR agency came up. I'd only written three press releases at the college, but thought sod it, I will apply.
I when back on my CV to my marketing jobs and put more emphasis on my writing and mentioned the press releases and even on my IT background I mentioned writing technical documentation. I had to write a press release as part of the recruitment process, and got the job!
Fast forward to now, I've moved away from pure marketing and work in communications, mainly Internal Comms. My current job is a two year fixed term contract, as an Internal Comms Manager within the.... (get this).... massive IT department!
Sorry I blathered for so long, but I guess I'm trying to say, from RTFT you possibly already have the skills to move into a different job. You just need to be cunning in how you word your CV and application. Getting contracts may help you get a foot in somewhere good too. Make sure you have a portfolio, maybe even a website.
Also, I have a skills matrix at the top of my CV, basically a table of my main competencies, things like copywriting, social media campaigns, artworking, project / campaign management. It helps the hiring manager see at a glance the skills I have and this matrix flexes to include my skills that are most relevant to the job I'm going for. I've been in new career 10 years now and I'm 41. Glad I did it.
More than happy to take a look at your CV, with your personal details removed if you like? PM if so.