Invested as much as I thought I wanted to two weeks ago. Now with even more drops should I invest more?

I just have a bunch of indexes and mutual funds through JP Morgan. I put in about 10% of my full wealth and I was comfortable with that bucket being a long-term strategy bought at a discount. Now that things have crashed even further, they are suggesting that I might give a little bit more to take advantage of the discounts. Is it really going to make that much of a difference? Are we near the bottom? Is it wise to invest more than 10% in securities? My other assets are 20% in a treasury portfolio and the rest in high-yield savings because I want be a little bit more liquid.