I agree that for the moment recruiting is tougher than usual. But hey, sorry to say it straightforward since I don't like to bullshit anyone - if you have already a lack of motivation for prep now I would really start questioning myself if consulting is the right thing for you to do.
Consulting interview prep is still a piece of cake compared to what you will be facing afterwards - please take that into consideration when making your career decision. To survive in midst of consulting workload, travel schedule, political games at client organization and many other complicating factors you need to be sure you that you really want that. Otherwise I am afraid you will damage your physical and psychological health and getting out of balance -which is bad for the firm, but even much worse for yourself.
Possibly not exactly what you want to hear - but nevertheless I hope you appreciate open words about this topic and that it might help for a good career decision which makes you happy and successful in the long run!