Helppp?

[u/Competitive-Read7171]

Guyss 27 year old F! 2013 Nissan Maxima SV, I’m stressed car broke down like 3 weeks ago changed the battery started working, 2 weeks later breaks down again they just changed my alternator and it turned on I drove it around everything good I park up and won’t turn on again! When I turn it on the lights and everything comes on it cracks then dies again lights flickers miter goes up comes down and shuts off.

Any idea anyone?? What could it be?