Man, I can really empathize with you here.
I spent like 16 years living down in Southwest Florida, the last 8 of which were spent desperately trying to keep a band together, or even getting one together in the first place. The problem was layered - I was doing a 70s glam meets Van Halen meets Queen kind of thing. Kinda theatrical hard rock. That absolutely was not popular between 2004 and 2012, especially down there. Furthermore, the music scene down there just wasn't that big. Not a lot of people to work with. And I discovered time and time again that, unless you are trying to do the absolute latest flavor of the month, or have a paid cover band situation going on, it's a nightmare finding like minded, talented musicians. There were dark days for sure...months and months of nothing going on at all. A couple year long stretch of not having anyone at all. I don't know what it's like in Ireland, but the way you describe it, makes me think it may be similar to what it was like down in Florida.
At one point, I finally had a lineup together, and we cut a record, and upon listening to the mixes, the bassist and drummer quit. While trying to rebuild, the rhythm guitarist quit. I had to start over again with just one other guy. So I built a new lineup, which took forever. We got up and running, and after about 2 years of stability, in fighting and petty nonsense caused 3/5 of the band to quit, just on the verge of doing our first tour (the dates were already lined up and everything). So I tried building it back again, but it was on fumes. More drama. More people quitting.
Every time I found myself without a band, it was wrecking me. Months and months of reaching out to what felt like the only 5 or 6 people in the whole state that played drums, just to find anyone that was interested. Working with people with subpar ability, just to get literally ANYTHING happening. My entire identity was wrapped up in the idea that I was the frontman in a killer hard rock band. It was not a healthy situation. Also, I'm glossing over soooo much. The lows were repeated, and crushing. Seriously soul crushing.
After one final gig in fall of 2012, with a cobbled together lineup, I couldn't take it anymore. I found a job in New York, loaded literally everything up (4 full stacks, 2 SVT bass rigs, a whole concert PA, everything...), and left.
In NYC, I found a far stronger music scene. Exponentially so. Within the first year I had a killer lineup, and we were already gigging. We met more musicians. My network grew. We cut a record. I got involved with a big music production crew here and made even more friends and connections. I became busier than ever before. I cut a solo album, and found a following overseas. At some point along the way, I found that I no longer had my whole identity wrapped up in one thing. I was cool going a couple of years without an official band, since I was doing diverse shows every single month with all sorts of musicians from all over the city. In some ways, when I look back on those years in Florida, I almost don't recognize that version of me.
The area you live is not going to change. There won't suddenly be a couple busloads of musicians moving to your area. You are almost certainly finding the same frustrations I did. There will be bassists, drummers, singers, anything you may be looking for. But if you aren't doing exactly what is passing for rock nowadays, forget it. They aren't going to be interested. The challenge of having a band is that you are trying to create art, but it relies so heavily on the involvement and commitment and stability of other people besides yourself. The way I tried to explain it to people all those years ago was to tell them to imagine they are a painter. Their entire identity is wrapped up in being able to paint. It drives them. They NEED to paint. It's what they wake up thinking about, and dream of at night. Now, imagine that suddenly, in order to paint, it required someone to hold the canvas, and another person to hand you the paint. It's a silly metaphor, but it helped people understand why it was just emotionally destroying me. So you have a hard decision to make here:
• Moving to a city could definitely solve your problem. But that may not be something you are able to do, or willing to consider.
• If moving is completely out of the question, another option you have (which wasn't as much of an option for me) is finding people to collaborate with remotely. If you open things up to the whole world, you can easily find like-minded players, looking to collab on some tracks. You could certainly finish the album that way.
• If playing live is mandatory, perhaps finding people that at least live in Ireland would be the way to go. You could do remote work, and maybe get together once a month to rehearse. It looks like Ireland is roughly the size of NY State. Not exactly small, but, small enough that a once a month thing and occasional gigging is totally feasible.