i know there is a lot of bitcoin wallet sites and they are popular
is it waste of time ?
yes, in my opinion it is a waste of time, because it is a "web wallet" and they are inherently unsafe so a new unknown one is not going to even get any attention.
Nonetheless, poeple wouldn't trust easily to just new wallet not unless it's developed by someone who has a good reputation and credibility. The fact that wallet isn't just a wallet but it is something to use carefully.
Maybe OP should just partnered or be a freelancer to some companies that continuously developing web wallet to gather more experience, in that way he could build credibility, at least.