A prime strategy for POTUS' campaign at this point might be to rush Biden's prosecution (whether in Ukraine or the USA, or both) in order to force the Dems to remove him from the ticket sooner than they want to.
This Dem strategy seems to rest largely on pulling Biden out around Sept/Oct… if Barr and the Ukrainians do their jobs well, they might force Biden to bow out in June/July.
Kinda like playing hurry-up offense in football.