Lots of open ground between the east bank of the Dnipro and the pre February fortifications near Donetsk. If and when the Ukrainians push the Russians off the east bank of the Dnipro, I could see the next push north to south between Dnipro and Donetsk. Potentially to get in position to put Melitopol, Berdyans'k and Mariupol under pressure, cut Russian east to west movement and put all the resupply ports on the Azov under fire. Ukrainians on the west bank offer fire support and keep Russians in place on the east bank of the river under threat.
Maybe this is wishful thinking but would massively exacerbate the already stretched Russian logistics.
Regarding Ukrainian offensive timing, some of the videos we have been seeing are starting to show some mud problems and slow down the pace of advance/resupply. I do believe the Ukrainians keep the pressure on once the fields freeze if they have the capability. Keep pressure on the Russians and force the mobilization troops to be used as piecemeal stopgaps.