Depends on your location and the length of stay.
Do you want to leave the boat for a long time or just to spend some time? Most marina will charges about USD 300 to USD 500 for a 44' mono. Usually they will have a slip for couple of days but a bit tough for long term stay.
Some name comes up but they are not exhaustive, so do your google
and on youtube.
Puteri Harbour - good security
Danga Bay - basic facilities
Sebana Cove Resort - isolated
Port Dickson - Admiral Cove
Port Klang, Pulau Indah Marina - very secluded
Port KLang, Royal Selangor Yacht Club - has a very mechanic/ship wright ss work Martin Grimley, slipway and hard stand for members' boat
Lumut - 2 marinas
, one has a sea lift
Penang Island - Next to the bridge, Jabatan Laut Marina, full ( monthly about USD 100 )
Penang Island - Straits Quay, very limited berthing
Pulau Langkawi - Royal Langkawi Yacht Club, next to Kuah town, a bit rolly because it is next to the ferries
Pulau Langkawi - Telaga Harbour, very popular marina. usually full. can drop anchor
can come up to the dockside and use shower
for nominal charges
Pulau Rebak - Rebak Marina, haul out
with hard stand
- Pulau Tioman, very limited berthing.
This time of the year, I would stick to Langkawi.
These are the few that comes to my mind for now. Let me know if you need more information.