Need product suggestions from real sellers

I work in quant/data science domain in finance and realised that my data skills can generate value in marketplace sales so exploring opportunity for any unserved need of sellers in which a startup can be made.

Would appreciate your views if there are certain services/softwares/analysis that the sellers would need but currently are not satisfied with the services/softwares available in the market. Would love to hear any frustration you might have as a seller.

Would appreciate any advice/suggestions!!