I am NOT a CPA! Hard to say without some more details, but having just gone through this the first time myself:
My understanding is that if the Ohio property is an LTR, you can only use losses from that to offset against LTR gains and rollover the rest. The only exception to this is if you earn Real Estate Professional Status.
The losses on your Delaware STR vacation property may POTENTIALLY offset against your W2 income. If your average rental period for the DE property was <7 days, and you didn't personally use the property for any more than 14 days, this gets classified as business activity income (as long as you materially participated in managing it). There are some hoops to jump through, but since this is active income you can then use any loss (including depreciation) to offset your W2 income.
A great many CPA's that are not real estate specific will not understand the STR loophole. Do your research on here and you will find lots of info on this. My rule of thumb - if you can't find a CPA that understands what you want to do, call 10 more!