reamendeing soil

ive been growing outdoors for a while but one spot in particular 2 seasons ina row. last year the plants did awful (obvi cause i didnt amend)but the year before they were 5-6 footers and healthy as hell, no ik i need a soil test but lets say im not getting one, what are the cheapest and fewest items i can use to reamend my spots? i have some compost thats super basic ( been very broke and no sourse of horse shit last year) but this year i can get my hands on horse shit so i will be composting that and i have worm castings i was gonna build a aact brewer but i want the soil done before i plant (obviously) anyway, what are some amendments i can get that wllcover all my bases? i wanna put most of my money towards my indoor so lets go cheap


srry how poorlythis was written goin to bed soon thanks for the helop

also fastest was to introduce micronutes? i bought azomite and gaigreen but it takes years and my fav compost guy on youtube adds like 100s of dollars per square foot like i deff cant afford that. i add a few cupsto my worm bin so im sure it wont get washed out