Things you must do:
Use B-up more for combos and moving cover, like puting space between you and your opponent(dont spam it)
USE THE KIRBYCOMBOS :D
-When medium-heavy oppoenet is at zero grab, forward throw, uair, grab, forward throw, uair then do whatever works best depending on their DI.
When you are knocked off the edge the best thing to do is use your hammer to recover ( if you are knocked high than stage level). When you do this, its a total mingame for opponents, do they run at you and risk being knocked to kingdom come, possibly KO, or do they wait for you to come to them? If they wait for you then that gives you a chance to think of your next move, and just plan ahead overall. If they come at you, Let them have it and use DI + B forward to put space between you and them. When you do this you still want to move somewhat ahead, but with this you have your hammer as deturent for any Aerials they might try to pull.
Swallociding is optional , but it can be dangerous.
Ill come back if i think of anything else.