Past html version , which wp version rejected, https://themeforest.net/item/dipto-one-page-digital-agency-startup-html5-template/22776500, Reject for design. Now i want to convert this html version, will be eligible for wp conversion, this template? https://themeforest.net/item/nikna-business-consultancy-html-template/23251534
You won’t know until you submit it for review whether it is good enough. What I would say (and this is just my opinion) is that there are hundreds of themes like this on TF so your design will need to be pretty unique in order to pass the design review.
Honestly (and again this is just my opinion) I think this will also be rejected.
Others may disagree? so don’t get too disheartened.