The difference between NEM and BTC is too far now, NEM is ranked 262 and Bitcoin is ranked 1 in Coinmarketcap. I don't really understand the history of the NEM coin but I see that this NEM coin was created in 2015, this coin is very old and certainly has a long history.
If OP chose NEM in 2015, it might have been in its heyday around April 2018 because the price reached around 2 dollars. But slowly it continued to fall and fall and rise in 2021 around 0.72 but unfortunately now NEM has fallen back to a price of 0.02 dollars.
I personally do not recommend buying NEM coins because the chart if calculated all of it is decreasing, maybe it's time for investors to leave NEM rather than their money which will eventually become minus if HodL.