Do you think the market is overheated?

Do you think the market is overheated? Should I diversify, or just hold BTC? The main reasons why the prices of lots of cryptocurrencies, mainly Bitcoin (BTC), fell because in 2017, the crypto market was overheated by the meteoric rise. Do you think we’re close to the top? Should I cover my back using a trading bot such as https://napbots.club or you don’t recommend bots? Thanks