The most costly thing you can do as a startup founder is use your R&D team to hedge your bets.
Once you have product/market fit, your job is to hit the accelerator and execute as fast as possible toward escape velocity on your core product and business.
Figure out what your key performance indicators are, grow them (exponentially) and raise capital against your story.
Building products and features to support secondary businesses will just slow you down and reduce your chances of success.