Basic maintenance items can be mileage or time based. Your owner's manual should have a basic maintenance schedule. Essentially, if you drive a lot you get on the mileage schedule, if you don't drive a lot you base your maintenance schedule on time.
Cabin air filter - Change once per year or more often if you live/drive in particularly dusty conditions.
Check wipers and washer fluid level regularly.
Tire rotation - Every 5,000 miles.
Inspect brake pads and rotors - I do this when I rotate the tires.
Brake fluid flush and bleed - Every 3 years.
I should also mention that in my opinion if you don't know the service history of a used car you should assume that it needs everything. For example, if I bought a 2021 Leaf (= 3 years old) I would do a brake fluid flush and bleed immediately. I would also inspect the brake pats and rotors, check over the tires carefully for excessive or uneven tread wear, make sure the windshield wipers were good, check the 12v battery, etc.
I don't know what the dealership's multi-point inspection would entail. If you live in a state with annual safety inspections most of the basics should be covered.
I consider these to be DIY jobs. Youtube provides useful tutorials if you've never worked on a car before. If you're not comfortable doing you own basic maintenance you should recognize that outside of the battery system there's nothing on a Leaf that isn't found on any other car. In other words, any mechanic can take care of all the basic maintenance above. You will most likely get a better deal from an independent mechanic than the dealership.
Is it very hot where you live, such that you use the A/C constantly? Typically Leaf owners experience range loss during the cold of winter.