If the cranks are wobbling and the front derailleur can't reach the big ring .... First find out what is up with the cranks. Likely they are already ruined or will be soon, unless the BB bearings are completely shot.

Second either the FD is completely misadjusted, or possibly the chain ring is wobbling too far for the FD to reach.

Either way, it would be a Very bad Idea to ride the bike anywhere until you fix whatever is wrong with the cranks/ BB.