We looked at any jobs going. North West. Technically 20 mins from Letterkenny but traffic in Letterkenny is managed so badly sometimes it took an hour. We chose there as near family. DH and I are both qualified/experienced teachers (I specialised in pupil referral units in the UK) and also have web dev and marketing skills but the problem we came up against was we couldn't get Irish minimum wage jobs as these wanted a particular "type" of person, and we couldn't get UK WFH jobs as these wanted you to be based in the UK.
Before we finally left, DH even went for supermarket jobs and got nowhere at the interviews. As well as sales, marketing, copywriting, food service and shop jobs (all things I have experience in), I went for care jobs as I was a carer to both my parents for over 15 years but over there this is meaningless, you need a specific (expensive) qualification to work in care. I tried for jobs as far out as Sligo, Derry and Omagh and got nothing.
The last straw for me was that while technically you should be able to move your benefits, we were disallowed on a technicality and I fell into a situation with DC2 where Ireland wouldn't pay maternity allowance because they said I had to get it from the UK but the UK wouldn't pay maternity allowance because they said I was eligible to get it in Ireland (which I was by then, but Ireland don't follow their own rules with official stuff half the time and they invented extra rules to "disallow" it). They did the same with child benefit. At one point I was sobbing on the phone to them begging them to follow their own rules because I couldn't feed my children.
We definitely didn't just go "oh no I can't get a job in squid keeping we'd better waste another €10k on conveyancing and moving fees and throw away our lives here, take our kids away from their friends and leave our beautiful home." We seriously tried everything. But despite living in a reasonable sized town, we were too rural to get jobs and until we got jobs we couldn't buy somewhere where we could get jobs (and forget about renting with the Irish rental crisis). Total catch 22.
When we first moved there, we were WFH self-employed and didn't need jobs to support us (and we bought our house outright) but covid came and destroyed our livelihoods and we couldn't get them back afterwards. We're definitely not shit employees or people with bad attitudes etc, when we came back to the UK we just walked straight into very good jobs in SE England and we both had several offers to choose from (which felt nice after all that rejection in Ireland).
Good luck, but it really doesn't work the way it looks like it does on paper.
I think if I could do it all again, I'd stay in Northern Ireland where we were for 18 months before we moved to "the south". There are reasonably priced houses around Belfast (Newtownards and Bangor are great areas and there are a fair few other English around too), the culture in Ulster is decent, the people are good, it's generally safe (much safer than the news would have you think), you can get most major retailers to deliver to you (unlike in Ireland) and the beaches are just incredible because they get so few tourists compared to GB.
I'd return to NI in a heartbeat.