Sorry to draw your attention towards this or do not feel bad about this because from my little knowledge so far when you or any person invest in bitcoin they are not going to have their increase or profits back to top the ratio they were having before. I meam if you buy bitcoin in ratio of 0.009btc even though bullrun comes you don't have 0.010btc or 1 BTC the same value you had is same thing that will be left in your wallet if you don't regularly top it, then again, where you would notice an increase is from the dollar equivalent, lemme say if you bought 0.009 BTC at the rate of $30k and bullrun comes and bitcoin gets to $70k all you need to do is to multiple your ratio with the price of bitcoin to get the increase you were talking of and not having many bitcoin as profit.
Hey friend you will buy bnb smart chain from centralized exchange like Binance send it to DEX exchange likeTrust wallet.through thesam smar tcontract. then go to Dapp search for pankake swap then you can use Binance to buy other other currencies. Come to think of it how did you think people buy all those meme,shit and altcoin on trust wallet. That is how I was able to buy some altcoin in my wallet about a year ago.