600-1000 Elo

Hey Guess, I play chess since 2 years and a I'm kinda stuck around 500-600 Elo and reach out for some tips to climb towards 1000.

I try to adapt some openings, get Pawns in the center, develope my pieces (especially bishop & knight), try to castle within 10 moves and of course minimize blunders.

Also I have a negative winrate with Black for some reason.

Any helpful tips?

thanks in advance