L1A eligibility question

I was hired by a company in US on TN1 in Oct 2015 and relocated back to Canada on work in sept 2016. Now because of lack of work in Canada, they want me to move back to US. Its only 6 months till now and I will need another 6 months for L1A eligibility. Can I go on loss of pay for remaining 6 months and then apply for L1A?

Can a TN1 be converted to L1A?

Or I understand that TN1 can be converted to H1B. Can the same be considered for EB1 category?

Thank you