In a bear market, the worst algorithm anyone can mine are those that consume lots of power for example kawpow algorithm, since this same algorithm is what ravencoin is currently using I have to warn you, do not mine ravencoin, mine Flux or other.
This is already a question for the mining calculator.
On cold video cards, you can mine any coin, on hot video cards you will need closed cases with additional cooling. But winter is coming and an open window is enough to cool 5-10 mining farms, so you can mine the most profitable coin.