I would say you can get from 30k to a million by the end of the year.

It would only take 3 really good ICOs or one to two coins that shoots 500x or more.

Most people try to spread their portfolio out to minimize risks, but if you are shooting for 1 million, you are going to have to go all in on something.

For me personally, I would do an ICO.
If you do your due dilligence, you are almost guaranteed to find a good investment.
Many people believe that icos are risky, but I don't see it that way at all.
The ico environment is very healthy with bad startups and also incredible new companies.
By doing your research, you will find an amazing company to invest in.
If you are not sure how to investigate an ico, there are a MILLION threads here with advice.

Your first ico you go from 30k to 150k, 2nd one 150k to 500k, 3rd one 500k to 1.25mllion to 1.5 million.
Make sure you try to contact the devs personally to arrange such a large investment.
If it's a good company and ico, they will accomadate you.