a lán taitnimh (tuiseal ginideach tar éis “a lán”)
as an mbliain (or “as an bhliain” in Gaeilge Uladh)
Go n-éirí an bóthar libh implies travel -just “Go n-éirí libh” or “Go n-éirí an t-ádh libh”
It’s “todhchaí”, not “tochaí”, but “don todhchaí” doesn’t really work here – it’s a bit literal. “Sa todhchaí” might be marginally better, but “go n-éirí” already implies a wish for the future, and adding “sa todhchaí” doesn’t really help.
“agus le togáil a scoil nua” – I’m not sure what you’re trying to say here, but if it’s “and with building the new school”, then you need “leis an scoil nua a thógáil”
Ádh mór leis an scoil nua a thógáil
Bain taitneamh as do laethanta saoire. (Maybe spellcheck changed that to Saoirse?”
Note that you used the plural in “Go n-éirí libh”, but the singular in “bain taitneamh as do” – the plural would be “bainigí taitneamh as bhur”