Ethereum would continue growing stronger as its peak would emerge at the end of 2022 or early 2023. So, what youre looking now on coinmarketcap (ETH price) is still very cheap and i don't think we can find 3k or 5k in the near future, so just keep buying as much as you can and you will not regret it.
ethereum is the same as bitcoin the longer we store it will continue to move up the price instead of going down, but for the peak it could be ethereum will be the same as bitcoin which will reach renewable ATH by the end of this year and ethereum will be able to reach ATH $ 1K maybe even will more.
but to reach a price like you said at $3K-$5K probably won't happen in 2022 either but maybe when bitcoin's fourth halving.