I don't know what kind of alt you owned so cannot judge or give my comment about the "wrong" or the "good" you have made. I personally have at my bitcoin wallet only some thousand satoshi because all my bitcoins are invested. So sell a possible investment to have bitcoin in your wallet if you have possibility to invest those cannot be something good according to me. Bitcoin may be an investment on itself if thought that it is hoped that its value will be increased in time. But have more than this (if it will be so) is twice better. I have invested even in alt and one of those (etherium) is going very well. If go in this way the profits will be considerable. So have sold all your altcoins may have been a wrong choice if in your portfolio has been even etherium. At least this alt that is followed by me. But must be even others.