BTC is an investment itself, so putting money in is always good... Don't turn to burning massively, but the extent to try some is always worth it if gains continue.
Don't forget that the need to diversify is sufficient, so always reserve your fiat.
yes nowadays bitcoin holding is a good source of investment if someone will wait for a longer time with their money and will not spend them or sell them then they will earn a good income when the price of bitcoin will rise in the future.
Yeah I think it is right that now investment is pretty good and bitcoin will rise its price in the future.
But I think you should do trading as well beside investment. From this you should earn more money for the efforts you will be putting to make some bitcoins.
Trading is negative sum game. Only very capable trader can make money.