How to get back into crypto?

I sold off all my coins back in 2022 thinking crypto was dead and I decided to check the price recently on a whim and was shocked to see the price went back up. I was mad at first but I have only myself to blame. Quick to fall, Quick to rise back up even higher. I want to invest back into crypto permanmetly, but kinda forgot what to do? I don't even remember what altcoins I was watching. I think my portfolio was 50% ETH 30% BTC 20% alt(CHAINLINK). Is this a good ratio? What are the best exchanges? I used Coinbase Pro but it seems they replaced it with something called advanced? I had a cold wallet(the $50 trezor one) but I want to switch to hot wallets. Any good ones? Any other advice is welcomed.