Can anybody help my leaves are turning yellow and curling up downwards

Looks like Acidic soil i think

High Malikdabarber, Beautiful garden! But I can see that the tips are just a little nute burned. And the leaves bending down like this is a sign of overwatering. So you want to cut the nutes down just a little (75% what you gave before). And let the soil dry out (almost) completely before your next watering. Sometimes I do like to water only 50% from the pot and give the other 50% the next time. This way there is always oxygen available for the roots. Goodluck and Happy Growing! 😋

Please do two things: read NobodysBuds comment below and start a diary. We can't possibly know what has actually happened with your grow if you haven't told us anything - and we certainly can't tell you what has happened in the last 3 days that has made her react this way... Good luck!

need a bit more info... check pH - slurry or runoff... don't expect it to be exactly what you feed nor what the substrate is, but it shouldn't be significantly off... later you check in runoff the better, probably... with a slurry be consistent with volums of soil and water used.. start with a known pH and can know from baseline how far off it is. don't go guessing on nutes until you know pH is square. if you are soilless, look up manic botanix nutrient ppm calculator. type in you guaranteed analysis labels and tabulate what you feed... N 120-140 / P 50-60 / K 180-210 give or take ballpark is a good ratio of npk... the secondary nutes will vary a bit based on tap water. shoot for a 650-750ppm mix with similar ratios. get a religious 10-15% runoff waste water and won't un into many poblems that take more than a 5-10% adjustment... for environmental factors or genetics etc... soil is more trial and error and those numbers above aren't much help until all the amendments and nutes in the soil are used up and the soil is likely higher that "1.5ec" at any given moment... there is less known about what is in the soil to start... if fertilizers used don't have guaranteed analysis you don't know how consistent they are etc etc... a lot more reliant on observe and react... and familiarity with the products used is key. can reach the same ends.. this isn't citicism.. just facts. once all mapped out can be less work than soilless and equally happy plants. (though chelated nutes allow for higher growth-rate potential)... So, consider what you've done so far - any recent changes? i see minor tip burn, a little clawing (down) and maybe the start of interveinal chlorosis on 1 or 2? or do you mean the new growth is yellow? that can be from good gowth or possible too much p or k and if accompanied by thin blades points to high P. if you recently did a "bloom" feed, i'd wager it could be elevated p or k. the clawing tends to be a sign of over-feeding in general.. too many dissolved solids. but... with so little info.. don't act on this alone.. if it matches up to what you have done, sure... a little investigation or patience is always wise. hopefully slow moving and can make certain before accidentally exacerbating the problem... anyway, more is not always better... becareful of boosting p and k.. do so slowly andn incrementally until you are comfortable with what you see.. then you can start there promptly next time.