It is totally no problem if you sold your shitcoins for Bitcoin. There are many altcoins which have no good progress, they are surely better to sell than keep holding them for a longer time. Few years ago, I honestly regreted that I didn't sell some of my shitcoins faster, now they become dead coins already. If I sold the random altcoins at that time, and keep the top altcoins only. I've the funds to buy more Bitcoin. However, this is a good lesson, never trust on random altcoins! Just keep holding those top altcoins only...