I suggest you to withdraw coins from exchange and lock them in Proof-of-Stake mining
Nice to have some free coins, while you waiting for the rise.
https://docs.decred.org/mining/proof-of-stake/
Can we PoS ourselves?
As in solo PoS mining? Yes, but you will need 100% uptime on your wallet or you risk missing votes / being rewarded.
Otherwise, you can use staking pools. Good list with pool stats at the bottom of the page: https://dcrstats.com/
And if you don't want to handle staking yourself, there's the Evolution pool, which handles buying and staking tickets for you: https://evolution.dcrstats.com/en
It's worth noting that the Evolution pool involves giving control of your funds away. The Decred devs strongly advise against this, with good reasoning.