OK, if you had your tracker back in 2016, you would have had an extra €30k. But you would have most likely sold your old home and transferred the tracker to your new home. So you would have had €270k in the market, rather than €440k. If house prices have gone up by around 20% since then, your two houses have gone up by about €90k. If you had only one house, it would have gone up by €55k. So you have gained €35k by losing your tracker.
I suggest the following
1) Sell your current home. You will have a lot of equity in it, I presume.
2) Sell your investment and move the tracker to your new bigger home.
Brendan