I’ll like to address the first question, the universe’s fate looks more likely happen in heat death according to multiple astronomical observations.

For rest of the questions, it’s difficult to produce a factual statement, but I’m happy to toss two cents here. If we have a Big Crunch, it wouldn’t be same as before, it’s like a scrambled egg, the fundamental force will be same but matters and energy will be all over different place. It’s very to difficult to understate an infinite time in “Big Crunch” universe because it becomes stupidly, geometric exponentially long to see every pieces in universe fall in exact order just enough for a conscious being to experience same anxiety twice or more. If we shuffled a pack 52 (52!) cards randomly, we will see every possible sequences than experience the same inescapable anxiety in “Big Crunch” universe. Basically, an odd for this to happen is next to zero, but very small sliver odd though.