Im overwhelmed , I need help

So , I started playing terraria again after 2 years and I completely forgot that after defeating WOF the curruption starts spreading and as a result I forgot to protect my villages and now 50% of my snow biome is curropted and I had to move the npcs in the snow biomw to a sperate location in the snow biome , and all my other villages seem to be safe , but there is always a fear that the curruption will spread to these other biomes and I dont know how to stop it , and I dont know if I focus on actually progress in the game or do I just focus on stopping the spread , what do I do

TLDR : Im scared about curroption spread and dont know I should focus on actually progressing in the game or should I stop the curroption spread first