BUT right now as you can see bitcoin has grown too much in only one year. most of it is perfectly understandable because we have had logical reasons for the rises so far. such as end of a 3 year long scaling debate, adoption of bitcoin on a massive scale by a couple of countries like Japan, and finally the last big news was the mainstream adoption of bitcoin in US.
but it is still riskier than normal to invest right now. so my advice is that if you chose to invest, do it with more care and keep your eyes on the price. you can also wait for a considerable drop like 30% before you start investing.
Yes, investing in bitcoin is always topical. But I would not refuse altcoins. It's boring just watching how increases or decreases 1 currency. For me, it is much more interesting to sell, buy, follow news and market changes.