I think that Ether and many tokens have a strong coupling with Bitcoin in terms of price and I think that it should not be this way if we look at value objectively. Do you see signs in the market of these coins being finally diverging in value?
Nope. Overall the entire crypto market is still being led by bitcoin's price movements.
Ethereum will still show strong signs of growth when bitcoin price grows. Historically Ether has outpaced bitcoin in price growth when bitcoin has gone up, but also outpaces bitcoin's losses when bitcoin goes down.
I don't see a decoupling or a halt in this price relationship any time soon, unless Ethereum goes a completely different route to bitcoin.
Overall, I don't see neither bitcoin nor ethereum to perform strongly this year, but I think it makes a good time to start buying those coins.
Thats true, Bitcoin is still the top in the crypto and the price of Bitcoin is still the benchmark of other coins. If Bitcoin decreases then other coins will also fall.