All you need to do when changing brokers is to open and fund the new account. If it’s a US based brokerage you will need to put in $25k plus to keep daytrader status on the new account.
You will find it extremely hard if not impossible to transfer any OTC stock to another broker as most of them flat out refuse to take any OTC stocks to fund your account with.
Etrade used to accept OTC stock transfers in via ACATS - which is the electronic transfer of account holdings from one broker to another. I know this because I did it myself. Since then as far as I can remember nobody else has allowed me to transfer in an OTC stock.