I've said this countless times before. When you want to buy Bitcoin to hold, it's literally never a bad time to buy. You'll always profit in the long run.
I really appreciate your answers. Another question, should i also invest like %5-%10 of my budget on altcoins for short term profits, like ETH, LTC etc? Do you have any suggestions for alt coins? Which ones should i focus nowadays?
Most of the Top 20 coins by market cap are good options. My favorite ones are Monero, Ethereum, Litecoin and maybe Decred. You could put some of your budget into some of them but by all means do some research on them first. Know what you're getting yourself into.