My wine in progress is not taste great

Hello ! First time wine maker here!

So I did the whole fermentation thing with red grapes, now it has stopped and I am planning to leave the pulp macerate a bit longer before racking it up for malolactic fermentation. Out of curiosity, and with more faith than expectation, I took a sip.
It tasted quite acidic (I guess this will disseapear with MLF?), and watery/tasteless... The thing is I didn't add any water to the juice! Adding some sugar made it slightly better but maybe that's the sugar addict in me!
Will it build flavor as it ages ? And in that case, is the taste going to change drastically or not so much?