With a port your size, you should not be keeping anything in cash, and you can make money more quickly by focussing on the short term.
Pay attention on Friday evenings to the openers, and whether they are opening higher or lower than expected. If there's a big difference, invest as much as you can, and disinvest after the adjust on Sunday.
On Mondays, check what Starbonds are adjusting the next day and whether any of them are going to have big adjusts. You can check websites like www.kaigee.com for this information. Ahain, invest as much as you can, and disinvest after the adjust.
The rest of the week, keep an eye out for news. Moviestocks often take a big jump - or a big hit - when they are in the news. Buying, or shorting early, and getting out when the price movement stops can earn you a lot of money.
This advice totally depends on your playing style btw. This is just my recommendation if you check in a couple of times each day.