Renew a BRP expiring

Hello Expat Family.
I’m just confused as I wanted to prepare in advance for my next move to remain in England.
Well Im Moroccan and married to British citizen. I moved to England 23th December 2017 on a spouse visa ( with a visa sticker on my passport) then I got a BRP which has an expiring date of middle September 2020. So I stayed almost 2 years in England but I don’t know what to do next? And which route I’m on, is it 2ans half years route or 3 years ? Why my BRP expiring September2020? I don’t know really and seeking help.
Please let me know which route I’m on and what to do to extend or renew and how to do it ? And is it possible to apply in advance ?
Thank you all

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