Re: visitors visas etc

Good Morning!
We have been following your blog for sometime and have finally signed up!!
We have been to the North coast DR many times and on our last visit, we purchased a villa between sosua and cabarete! With the plan of using as a vacation property , and a rental property until we can be there on a longer basis.
Retirement is 5 years away,(sooner if we can swing it) Until then we are there a little longer every year. And that is where my question is. This year, we will be there a month, so our visitors visa will be fine, but next year will be at least 2 months and we think our tourist card will expire, so what will happen? The next year hoping to be there at least 4 months. Is there another form of visa we can get that covers us for the longer periods?
Eventually, we will be there close to full time, have plans to have a small business to supplement our retirement income.

Thanks in advance for any help!!

Donna and Ken