It's trendy these days to be anti colonialism, but as soon as you mention ireland all the support fizzles out. Fucks up with that? Most young people hate tories, hate british empire, etc etc, but then you say IRA and everyone gets scared. It's not even like my generation has an emotional attachment to it either - it's before our time
Welsh movement is building through: https://www.yes.cymru/
The Irish movement is a continuation of the struggle of the IRA and Sinn Fein. They'll get there eventually when something occurs to split the unionists. The left has made massive gains in NI and the momentum continues to be towards reunification. Unionists hold about 42% of the vote and Reunification parties (Sinn Fein and SDLP) hold about 38%, the remaining parties are "neutral" on the union.
It was still slowing moving more and more towards independence over time but Brexit really kicked it into high gear. It accelerated all the existing independence movements and I would argue it created the Welsh one.
Strongly recommend following Paul Morrin if you want to follow a good Irish comrade. Here's his video on nationalism and why it's good when it's the right type of nationalism .