Spot onA sad fate for the universe but IMO we are just 1 universe and heat death won't happen when we run into our bubble friends all around us and expansion comes to a halt.
There aren't any galaxies in the contents of our big bang older than the big bang. The oldest galaxies are just over 13by old but they are 30b+ light-years away because the space between us and that galaxy has been expanding faster than light speed, as per Hubble Constant, as per IG in post 18and distant mystery galaxies are now starting to come into view at much older than our universe age.
I don't think any more galaxies will 'come into view' in our life time, more like a few million years time. It's probably just down to better telescopesand distant mystery galaxies are now starting to come into view