If your points or miles are going to expire, you can sometimes keep your account active by buying currency from your program, or adding points and miles from other programs.
To determine if one of these options will work for you, log into your Points.com account and go to the 'Trade, Exchange & Buy' page. Choose to 'get more into a program' and select your loyalty program from the drop-down list. You may be able to exchange points/miles between your programs, trade with others to get more, or buy currency to keep your account active.
Another option would be to choose your program from the list of programs on the Points.com home page to find out what you can do with the program on Points.com.
Always be sure to check with your loyalty program first to make sure that this will keep your points/miles from expiring as every program has different rules.