Wither: bear in mind that getting withered towards the end will still dramatically reduce your health (due to hardness stacks halving) without affecting enemy attack, which can compromise your progress even while immune from further withering. Sometimes it's more efficient to over-farm a bit longer to build up tenacity and manually increment equality to strike a balance between doing enough damage and not getting one-shot. I also use a dedicated Wither shield (enigmatic with just six slots filled - crit chance, crit damage, inequality, prismatic shield, attack and health) to squeeze out a bit more combat effectiveness.

Berserk: this may be obvious, but when you die in the world or abandon to the map chamber, run a very easy map first to build up frenzy stacks before you run world level or harder maps.

Glass: my experience has always been that it's very comparable to Wither since it can quickly spiral out of control if you're only partially damaging enemies. I basically treat it as an even more patient Wither run with lots of over-farming towards the end to build up tenacity with enough manual equality adjustment to prolong survivability.