You are looking for something where you can invest for bitcoin? Why not just leave your bitcoin as it is and that's already the best investment that you can take. If you are looking for any altcoin or ICO then you have to take your time doing research on what are the best ICO's that you can invest with. Just keep your bitcoin and hold it until the price goes up again. Avoid those unrealistic returns that an investment is implementing, avoid cloud mining and HYIP (Ponzi schemes).