A few years ago I inherited an IRA. It's now referred to as an IRA-BDA. It is all one mutual fund. As it stands now, when I withdraw from it I have the option of taking out 10-15% taxes on the amount withdrawn, or waiting until tax time to pay it.
1.Would it be more beneficial to change my IRA-BDA to a Roth IRA or exchange the Mutual fund shares for a new mutual fund which is rated higher. (the current fund seems rather stagnant). Would the way I withdraw and pay taxes change?
2. To convert to a Roth IRA would I have to sell all the current shares (this would change my tax bracket by tens of thousands), pay the taxes on that transaction and then open a new account, a Roth IRA or is there some other way to convert it?

Thanks for any advice or info you can offer.