The rovers on mars are quite far from olympus mons. Pretty sure it would take a really long time to get there, like years or decades.

It's technically possible to send a new rover to climb that mountain but the scientific justification for that expenditure is lacking.

Landing on an inclined surface is more difficult / dangerous than a nice flat level area, so the risk may also be a problem.

Mars has killed a few probes. Bear in mind that if anything goes wrong with the multimillion dollar rover at any stage it can lead to politicians cutting funding for future exploration.