I am not sure I fully understand your question. however, I will try to help you:
IF you are asking what you should be doing for the next 5 years to have a shot at MBB in 5 years; Apply to MBB every single year until you get in.
MBB career is much easier if started as soon as possible. for so many reasons among which the most important one is - you get your "toolkit". outsiders/experienced hires are rarely performing well in MBB and they suffer more than average for the first years.
IF you cannot do MBB - boutique consulting is usually better than tech companies. obviously if you compare GOOGLE strategy team vs an unknownd boutique consulting firm my answer is different.
usually when too many IF scenarios are involved at this stage, my first suggestions would be for you to stop over thinking and start focusing on the preparation instead.
if questions/doubts - ping me for an intro call
