I have not done the sums, but it depends on what confidence you have in Steem. For now the price is low due to general crypto issues. I think you have to decide what you want from it. If it is just money then there may be better options. If you want to be part of something radical then it may be worth investing what you can afford. If you can boost your SP a bit then people will appreciate your votes. I see some of your posts have done well, so you have something people want to see.