Marriott webpage summarising ways to keep points from expiring :
https://www.marriott.com/loyalty/poi...ck=2043917&lk=1000584075

Fastest easiest way is to buy 1,000 points for $12.50US. https://buy.points.com/PointsPartner...EN&product=BUY

T&Cs re: 24-month points expiration:

http://www.marriott.com/marriott-rew.../expiration.mi

”1.6.d. Points Expiration Policy. Members must remain active in the Loyalty Program to retain Points they accumulate. If a Member Account is inactive for twenty-four (24) consecutive months, that Member Account will forfeit all accumulated Points. Members can remain active in the Loyalty Program and retain accumulated Points by earning Points or Miles, redeeming Points, or purchasing Points (as described in 2.9) in the Loyalty Program at least once every twenty-four (24) months, all subject to the exceptions described below. If a Member does not maintain an active status for five (5) consecutive years, the Member’s Account may be deactivated. Once Points are forfeited, the Points cannot be reinstated, but a Member can earn new Points, unless that Member’s Account has been deactivated.

i. Not all Points activities help maintain active status in the Loyalty Program. Examples of activities that do not count toward maintaining an active status in the Loyalty Program include, but are not limited to:
A. Gifting or transferring Points; however, converting Points to Miles or Miles to Points does count toward maintaining an active status;
B. Receiving Points as a gift or transfer

ii. Awards redeemed by a Member prior to Point forfeiture are still valid even though the Award may not yet have been fulfilled at the time of Point forfeiture. However, if those Awards are cancelled after the Points expiration date, those Points are still subject to forfeiture. For example, if a Member redeems Points for an Award Redemption Stay that occurs after the Points expiration date, and then cancels the reservation prior to arrival without having completed any qualifying activity to extend the expiration date, those Points will expire.

iii. The Points expiration policy does not currently affect Points in a Lifetime Elite Membership Account; however, the Loyalty Program may choose to apply a Points expiration policy to Lifetime Elite Membership Accounts in the future.

Note : Points expiration was paused until Dec 31 2022. As of Jan 2023, points expiration was reinstated.

Did you extend Marriott Bonvoy® Points Expiration?
To provide you ample time to redeem Marriott Bonvoy® Points, the expiration of Points was paused until December 31, 2022. At that time, your Marriott Bonvoy® Points will only expire if your Account has been inactive for at least 24 months.