I suggest that you focus on initial planning because business and investment must be balanced for better financial management, if you decide to allocate funds for one of them but you don't have a reserve fund to handle business or investment risks, it's better to run 2 aspects at once because business and Investments will have high profit opportunities if managed properly based on their respective plans and strategies.

I don't know your job and monthly salary but I'm assuming that the fund is $800 of income over 2-3 months, so be careful in your decision and the best option is to divide the fund into 2 parts for business and investment purposes.