Considering moving from direct suppliers to marketplace sourcing [I will not promote]

Hey there,

Started my electronics business in january selling PCs, monitors, gaming setups etc. Been working with a supplier from czech republic and margins are decent but wasting time on shipping. Sometimes 1-2 months which sucks when trying to fulfill orders.Also keep running into situations where I cant find what customers want .Now im thinking about switching to sourcing from marketplaces. Better visibility, faster turnaround, way more control over whats available.

Did someone here successfully manage this? Like going from traditional suppliers to marketplace sourcing? Im at around 35k/month so margins will probably be tighter but if i can move faster maybe its worth it.

What am i not thinking about here,