If you wish to hold some coin then use exchange only for during exchange. Just exchange your coin and transfer on your personal wallet that you have controlled. Specially you can use hardware wallet.
Because many exchange hacked buy hacker. Many people loss their capital by hack.
So please don't hold your coin on exchange for long time.
I strongly believe that you should not invest long term at this point, you can see that bitcoin prices are constantly fluctuating and difficult to guess, the market is bearish in the long term, because So we can only know the bitcoin price will decrease but can not know exactly at what time. So if you keep long term coin it will be very dangerous and very risky if the bitcoin price drops sharply.
It may be helpful to act accordingly but do not fall in complications and just follow the basics of market which will keep you alive and you will be able to survive in the market. without this one can not survive and will need to leave with loss because he do not know how to handle things then how can he face with situations and making decision is not an easy thing to perform it needs your best knowledge.