There is nothing like bull run in 2019 , so kindly make up your mind and buy little you can afford now and trade small by small till it might become an ocean in soonest, the market is always swinging and that is the the bull that make a little to be a big and never expect the one time run to success.
i do not think will be a next bull like BTC 20k again in near future
Its always possible but rather not expect that much. The last bullrun which didn't continously grow to exceed up to more than $25k had already disappointed a lot particularly to those who bought at the ATH.

Personally, I'd like to see it grow gradually which we can have some time to trade slowly til we can accumulate more.