thanks for your question.
based upon law, you can open and operate as many LLCs or other business entities as you desire. the only thing that could hold you back could be if your current agreement has a clause which requires your efforts to be on behalf of that LLC and company/enterprise. if it does have such a clause --- and they often do --- you would be responsible for the operation of the current business and may very well be obligated to devote your time towards it.
of course, if the present LLC is not operating and performing no business functions, it may very well be defunct. further, if you can not get any repsonse from your partner, it may also be done and you would be able to move opn and start your own business.
either way, you should definitiely take the necessary steps to either dissolve and unwind the present LLC or resign as a member or have him resign as a member so that that does not hang out there.
Please let me know if you have any other questions, or require clarification of this matter. Otherwise please hit "ACCEPT", so I may receive credit for my response. In addition, if you feel it warranted, please consider a Bonus and Positive Feedback. Thank you.