I would stay on the tracker at that margin.
If you fix you will be "out of the money" for the forseeable future. For example the best 3 year fixed rate available is AIB at 3.1%. After this morning's cut you are on 2.05%. It would take an ECB increase of more than 1% before the fixed rate would be less than your tracker. The best 5 year rate I can see is 3.6%. Again, over 150 basis points above your new tracker rate.
If the ECB pushes rates up to 4 or 4.25 % again in the coming years, you will have been in the money long enough on the tracker to outperform the fixed rate option over 3 or 5 years.
As stated above, you will not get the tacker back either and variable rates are typically 1.75% above ECB.
If you wish, you could fix your repayment and not the rate by asking the bank what the payment would be on a 5 year fixed rate. Then write to them to increase the monthly repayment to that. You would stay on the tracker but clear your mortgage quicker.