It is not only traders who monitor the market and monitoring the market doesn't make you a trader unless such investor is regularly cheeking on the market to see when there is an increase so they can sell out, there are investor who monitor the market to accumulate aggressively or accumulate more Bitcoin when there is a dip and still continue with their DCA strategy so will say you are wrong by saying that monitoring the market is for traders.
The word monitoring in this term simply means checking the market on a daily basis, if I may ask why should an investor monitor bitcoin price other than the fact they want to sell for quick profit. I might be wrong by trying to generalize this act but, majority of investors who look forward to bitcoin price fluctuation wants to either buy and sell. In what ever way an investor chooses they might get distracted in process by mere studying the price meanwhile traders at the other hand are not even knowledgeable to the point where they can get a good return basically trading is unpredictable and no amount of knowledge can guarantee, if an investor wants to check the price then buy and hold for long term that’s totally different from monitoring the market.
Regular market monitoring is not a good habit for an inexperienced investor. I can't speak for experienced investors, but it is absolutely unnecessary for a long-term investor. It may be wrong to call someone a trader as a result of market monitoring, because just observing the market does not make one a trader. However, observing the market unnecessarily without any purpose is nothing but a waste of time and effort.
If you claim yourself to be a long-term investor, then keep buying regularly and keep moving towards the goal, ignoring the price. If you want to introduce yourself as a trader, then I apologize in advance for losing a lot of money in the beginning. If you want to call market monitoring aimless, then I advise you to spend your time on something more effective.